0fe65b5365
### What changes were proposed in this pull request? This PR proposes move ORC data source options from Python, Scala and Java into a single page. ### Why are the changes needed? So far, the documentation for ORC data source options is separated into different pages for each language API documents. However, this makes managing many options inconvenient, so it is efficient to manage all options in a single page and provide a link to that page in the API of each language. ### Does this PR introduce _any_ user-facing change? Yes, the documents will be shown below after this change: - "ORC Files" page  - Python  - Scala  - Java  ### How was this patch tested? Manually build docs and confirm the page. Closes #32546 from itholic/SPARK-35395. Authored-by: itholic <haejoon.lee@databricks.com> Signed-off-by: Hyukjin Kwon <gurwls223@apache.org>
1632 lines
76 KiB
Python
1632 lines
76 KiB
Python
#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership.
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# The ASF licenses this file to You under the Apache License, Version 2.0
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# (the "License"); you may not use this file except in compliance with
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# the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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import sys
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from py4j.java_gateway import JavaClass
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from pyspark import RDD, since
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from pyspark.sql.column import _to_seq, _to_java_column
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from pyspark.sql.types import StructType
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from pyspark.sql import utils
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from pyspark.sql.utils import to_str
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__all__ = ["DataFrameReader", "DataFrameWriter"]
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class OptionUtils(object):
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def _set_opts(self, schema=None, **options):
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"""
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Set named options (filter out those the value is None)
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"""
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if schema is not None:
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self.schema(schema)
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for k, v in options.items():
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if v is not None:
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self.option(k, v)
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class DataFrameReader(OptionUtils):
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"""
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Interface used to load a :class:`DataFrame` from external storage systems
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(e.g. file systems, key-value stores, etc). Use :attr:`SparkSession.read`
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to access this.
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.. versionadded:: 1.4
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"""
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def __init__(self, spark):
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self._jreader = spark._ssql_ctx.read()
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self._spark = spark
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def _df(self, jdf):
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from pyspark.sql.dataframe import DataFrame
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return DataFrame(jdf, self._spark)
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def format(self, source):
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"""Specifies the input data source format.
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.. versionadded:: 1.4.0
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Parameters
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----------
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source : str
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string, name of the data source, e.g. 'json', 'parquet'.
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Examples
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--------
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>>> df = spark.read.format('json').load('python/test_support/sql/people.json')
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>>> df.dtypes
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[('age', 'bigint'), ('name', 'string')]
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"""
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self._jreader = self._jreader.format(source)
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return self
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def schema(self, schema):
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"""Specifies the input schema.
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Some data sources (e.g. JSON) can infer the input schema automatically from data.
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By specifying the schema here, the underlying data source can skip the schema
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inference step, and thus speed up data loading.
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.. versionadded:: 1.4.0
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Parameters
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----------
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schema : :class:`pyspark.sql.types.StructType` or str
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a :class:`pyspark.sql.types.StructType` object or a DDL-formatted string
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(For example ``col0 INT, col1 DOUBLE``).
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>>> s = spark.read.schema("col0 INT, col1 DOUBLE")
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"""
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from pyspark.sql import SparkSession
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spark = SparkSession.builder.getOrCreate()
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if isinstance(schema, StructType):
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jschema = spark._jsparkSession.parseDataType(schema.json())
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self._jreader = self._jreader.schema(jschema)
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elif isinstance(schema, str):
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self._jreader = self._jreader.schema(schema)
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else:
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raise TypeError("schema should be StructType or string")
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return self
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@since(1.5)
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def option(self, key, value):
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"""Adds an input option for the underlying data source.
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You can set the following option(s) for reading files:
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* ``timeZone``: sets the string that indicates a time zone ID to be used to parse
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timestamps in the JSON/CSV datasources or partition values. The following
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formats of `timeZone` are supported:
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* Region-based zone ID: It should have the form 'area/city', such as \
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'America/Los_Angeles'.
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* Zone offset: It should be in the format '(+|-)HH:mm', for example '-08:00' or \
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'+01:00'. Also 'UTC' and 'Z' are supported as aliases of '+00:00'.
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Other short names like 'CST' are not recommended to use because they can be
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ambiguous. If it isn't set, the current value of the SQL config
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``spark.sql.session.timeZone`` is used by default.
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* ``pathGlobFilter``: an optional glob pattern to only include files with paths matching
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the pattern. The syntax follows org.apache.hadoop.fs.GlobFilter.
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It does not change the behavior of partition discovery.
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* ``modifiedBefore``: an optional timestamp to only include files with
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modification times occurring before the specified time. The provided timestamp
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must be in the following format: YYYY-MM-DDTHH:mm:ss (e.g. 2020-06-01T13:00:00)
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* ``modifiedAfter``: an optional timestamp to only include files with
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modification times occurring after the specified time. The provided timestamp
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must be in the following format: YYYY-MM-DDTHH:mm:ss (e.g. 2020-06-01T13:00:00)
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"""
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self._jreader = self._jreader.option(key, to_str(value))
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return self
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@since(1.4)
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def options(self, **options):
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"""Adds input options for the underlying data source.
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You can set the following option(s) for reading files:
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* ``timeZone``: sets the string that indicates a time zone ID to be used to parse
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timestamps in the JSON/CSV datasources or partition values. The following
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formats of `timeZone` are supported:
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* Region-based zone ID: It should have the form 'area/city', such as \
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'America/Los_Angeles'.
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* Zone offset: It should be in the format '(+|-)HH:mm', for example '-08:00' or \
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'+01:00'. Also 'UTC' and 'Z' are supported as aliases of '+00:00'.
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Other short names like 'CST' are not recommended to use because they can be
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ambiguous. If it isn't set, the current value of the SQL config
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``spark.sql.session.timeZone`` is used by default.
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* ``pathGlobFilter``: an optional glob pattern to only include files with paths matching
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the pattern. The syntax follows org.apache.hadoop.fs.GlobFilter.
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It does not change the behavior of partition discovery.
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* ``modifiedBefore``: an optional timestamp to only include files with
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modification times occurring before the specified time. The provided timestamp
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must be in the following format: YYYY-MM-DDTHH:mm:ss (e.g. 2020-06-01T13:00:00)
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* ``modifiedAfter``: an optional timestamp to only include files with
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modification times occurring after the specified time. The provided timestamp
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must be in the following format: YYYY-MM-DDTHH:mm:ss (e.g. 2020-06-01T13:00:00)
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"""
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for k in options:
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self._jreader = self._jreader.option(k, to_str(options[k]))
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return self
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def load(self, path=None, format=None, schema=None, **options):
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"""Loads data from a data source and returns it as a :class:`DataFrame`.
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.. versionadded:: 1.4.0
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Parameters
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----------
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path : str or list, optional
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optional string or a list of string for file-system backed data sources.
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format : str, optional
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optional string for format of the data source. Default to 'parquet'.
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schema : :class:`pyspark.sql.types.StructType` or str, optional
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optional :class:`pyspark.sql.types.StructType` for the input schema
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or a DDL-formatted string (For example ``col0 INT, col1 DOUBLE``).
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**options : dict
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all other string options
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Examples
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--------
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>>> df = spark.read.format("parquet").load('python/test_support/sql/parquet_partitioned',
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... opt1=True, opt2=1, opt3='str')
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>>> df.dtypes
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[('name', 'string'), ('year', 'int'), ('month', 'int'), ('day', 'int')]
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>>> df = spark.read.format('json').load(['python/test_support/sql/people.json',
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... 'python/test_support/sql/people1.json'])
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>>> df.dtypes
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[('age', 'bigint'), ('aka', 'string'), ('name', 'string')]
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"""
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if format is not None:
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self.format(format)
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if schema is not None:
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self.schema(schema)
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self.options(**options)
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if isinstance(path, str):
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return self._df(self._jreader.load(path))
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elif path is not None:
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if type(path) != list:
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path = [path]
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return self._df(self._jreader.load(self._spark._sc._jvm.PythonUtils.toSeq(path)))
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else:
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return self._df(self._jreader.load())
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def json(self, path, schema=None, primitivesAsString=None, prefersDecimal=None,
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allowComments=None, allowUnquotedFieldNames=None, allowSingleQuotes=None,
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allowNumericLeadingZero=None, allowBackslashEscapingAnyCharacter=None,
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mode=None, columnNameOfCorruptRecord=None, dateFormat=None, timestampFormat=None,
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multiLine=None, allowUnquotedControlChars=None, lineSep=None, samplingRatio=None,
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dropFieldIfAllNull=None, encoding=None, locale=None, pathGlobFilter=None,
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recursiveFileLookup=None, allowNonNumericNumbers=None,
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modifiedBefore=None, modifiedAfter=None):
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"""
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Loads JSON files and returns the results as a :class:`DataFrame`.
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`JSON Lines <http://jsonlines.org/>`_ (newline-delimited JSON) is supported by default.
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For JSON (one record per file), set the ``multiLine`` parameter to ``true``.
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If the ``schema`` parameter is not specified, this function goes
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through the input once to determine the input schema.
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.. versionadded:: 1.4.0
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Parameters
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----------
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path : str, list or :class:`RDD`
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string represents path to the JSON dataset, or a list of paths,
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or RDD of Strings storing JSON objects.
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schema : :class:`pyspark.sql.types.StructType` or str, optional
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an optional :class:`pyspark.sql.types.StructType` for the input schema or
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a DDL-formatted string (For example ``col0 INT, col1 DOUBLE``).
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primitivesAsString : str or bool, optional
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infers all primitive values as a string type. If None is set,
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it uses the default value, ``false``.
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prefersDecimal : str or bool, optional
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infers all floating-point values as a decimal type. If the values
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do not fit in decimal, then it infers them as doubles. If None is
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set, it uses the default value, ``false``.
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allowComments : str or bool, optional
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ignores Java/C++ style comment in JSON records. If None is set,
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it uses the default value, ``false``.
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allowUnquotedFieldNames : str or bool, optional
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allows unquoted JSON field names. If None is set,
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it uses the default value, ``false``.
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allowSingleQuotes : str or bool, optional
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allows single quotes in addition to double quotes. If None is
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set, it uses the default value, ``true``.
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allowNumericLeadingZero : str or bool, optional
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allows leading zeros in numbers (e.g. 00012). If None is
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set, it uses the default value, ``false``.
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allowBackslashEscapingAnyCharacter : str or bool, optional
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allows accepting quoting of all character
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using backslash quoting mechanism. If None is
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set, it uses the default value, ``false``.
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mode : str, optional
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allows a mode for dealing with corrupt records during parsing. If None is
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set, it uses the default value, ``PERMISSIVE``.
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* ``PERMISSIVE``: when it meets a corrupted record, puts the malformed string \
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into a field configured by ``columnNameOfCorruptRecord``, and sets malformed \
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fields to ``null``. To keep corrupt records, an user can set a string type \
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field named ``columnNameOfCorruptRecord`` in an user-defined schema. If a \
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schema does not have the field, it drops corrupt records during parsing. \
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When inferring a schema, it implicitly adds a ``columnNameOfCorruptRecord`` \
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field in an output schema.
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* ``DROPMALFORMED``: ignores the whole corrupted records.
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* ``FAILFAST``: throws an exception when it meets corrupted records.
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columnNameOfCorruptRecord: str, optional
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allows renaming the new field having malformed string
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created by ``PERMISSIVE`` mode. This overrides
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``spark.sql.columnNameOfCorruptRecord``. If None is set,
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it uses the value specified in
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``spark.sql.columnNameOfCorruptRecord``.
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dateFormat : str, optional
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sets the string that indicates a date format. Custom date formats
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follow the formats at
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`datetime pattern <https://spark.apache.org/docs/latest/sql-ref-datetime-pattern.html>`_. # noqa
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This applies to date type. If None is set, it uses the
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default value, ``yyyy-MM-dd``.
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timestampFormat : str, optional
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sets the string that indicates a timestamp format.
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Custom date formats follow the formats at
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`datetime pattern <https://spark.apache.org/docs/latest/sql-ref-datetime-pattern.html>`_. # noqa
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This applies to timestamp type. If None is set, it uses the
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default value, ``yyyy-MM-dd'T'HH:mm:ss[.SSS][XXX]``.
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multiLine : str or bool, optional
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parse one record, which may span multiple lines, per file. If None is
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set, it uses the default value, ``false``.
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allowUnquotedControlChars : str or bool, optional
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allows JSON Strings to contain unquoted control
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characters (ASCII characters with value less than 32,
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including tab and line feed characters) or not.
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encoding : str or bool, optional
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allows to forcibly set one of standard basic or extended encoding for
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the JSON files. For example UTF-16BE, UTF-32LE. If None is set,
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the encoding of input JSON will be detected automatically
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when the multiLine option is set to ``true``.
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lineSep : str, optional
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defines the line separator that should be used for parsing. If None is
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set, it covers all ``\\r``, ``\\r\\n`` and ``\\n``.
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samplingRatio : str or float, optional
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defines fraction of input JSON objects used for schema inferring.
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If None is set, it uses the default value, ``1.0``.
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dropFieldIfAllNull : str or bool, optional
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whether to ignore column of all null values or empty
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array/struct during schema inference. If None is set, it
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uses the default value, ``false``.
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locale : str, optional
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sets a locale as language tag in IETF BCP 47 format. If None is set,
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it uses the default value, ``en-US``. For instance, ``locale`` is used while
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parsing dates and timestamps.
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pathGlobFilter : str or bool, optional
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an optional glob pattern to only include files with paths matching
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the pattern. The syntax follows `org.apache.hadoop.fs.GlobFilter`.
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It does not change the behavior of
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`partition discovery <https://spark.apache.org/docs/latest/sql-data-sources-parquet.html#partition-discovery>`_. # noqa
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recursiveFileLookup : str or bool, optional
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recursively scan a directory for files. Using this option
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disables
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`partition discovery <https://spark.apache.org/docs/latest/sql-data-sources-parquet.html#partition-discovery>`_. # noqa
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allowNonNumericNumbers : str or bool
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allows JSON parser to recognize set of "Not-a-Number" (NaN)
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tokens as legal floating number values. If None is set,
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it uses the default value, ``true``.
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* ``+INF``: for positive infinity, as well as alias of
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``+Infinity`` and ``Infinity``.
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* ``-INF``: for negative infinity, alias ``-Infinity``.
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* ``NaN``: for other not-a-numbers, like result of division by zero.
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modifiedBefore : an optional timestamp to only include files with
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modification times occurring before the specified time. The provided timestamp
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must be in the following format: YYYY-MM-DDTHH:mm:ss (e.g. 2020-06-01T13:00:00)
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modifiedAfter : an optional timestamp to only include files with
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modification times occurring after the specified time. The provided timestamp
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must be in the following format: YYYY-MM-DDTHH:mm:ss (e.g. 2020-06-01T13:00:00)
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Examples
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--------
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>>> df1 = spark.read.json('python/test_support/sql/people.json')
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>>> df1.dtypes
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[('age', 'bigint'), ('name', 'string')]
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>>> rdd = sc.textFile('python/test_support/sql/people.json')
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>>> df2 = spark.read.json(rdd)
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>>> df2.dtypes
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[('age', 'bigint'), ('name', 'string')]
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"""
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self._set_opts(
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schema=schema, primitivesAsString=primitivesAsString, prefersDecimal=prefersDecimal,
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allowComments=allowComments, allowUnquotedFieldNames=allowUnquotedFieldNames,
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allowSingleQuotes=allowSingleQuotes, allowNumericLeadingZero=allowNumericLeadingZero,
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allowBackslashEscapingAnyCharacter=allowBackslashEscapingAnyCharacter,
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mode=mode, columnNameOfCorruptRecord=columnNameOfCorruptRecord, dateFormat=dateFormat,
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timestampFormat=timestampFormat, multiLine=multiLine,
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allowUnquotedControlChars=allowUnquotedControlChars, lineSep=lineSep,
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samplingRatio=samplingRatio, dropFieldIfAllNull=dropFieldIfAllNull, encoding=encoding,
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locale=locale, pathGlobFilter=pathGlobFilter, recursiveFileLookup=recursiveFileLookup,
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modifiedBefore=modifiedBefore, modifiedAfter=modifiedAfter,
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allowNonNumericNumbers=allowNonNumericNumbers)
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if isinstance(path, str):
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path = [path]
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if type(path) == list:
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return self._df(self._jreader.json(self._spark._sc._jvm.PythonUtils.toSeq(path)))
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elif isinstance(path, RDD):
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def func(iterator):
|
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for x in iterator:
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if not isinstance(x, str):
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x = str(x)
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if isinstance(x, str):
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x = x.encode("utf-8")
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yield x
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keyed = path.mapPartitions(func)
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keyed._bypass_serializer = True
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jrdd = keyed._jrdd.map(self._spark._jvm.BytesToString())
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return self._df(self._jreader.json(jrdd))
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else:
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raise TypeError("path can be only string, list or RDD")
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|
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def table(self, tableName):
|
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"""Returns the specified table as a :class:`DataFrame`.
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|
|
.. versionadded:: 1.4.0
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|
|
Parameters
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|
----------
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tableName : str
|
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string, name of the table.
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|
|
Examples
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|
--------
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|
>>> df = spark.read.parquet('python/test_support/sql/parquet_partitioned')
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>>> df.createOrReplaceTempView('tmpTable')
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|
>>> spark.read.table('tmpTable').dtypes
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[('name', 'string'), ('year', 'int'), ('month', 'int'), ('day', 'int')]
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"""
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|
return self._df(self._jreader.table(tableName))
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|
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def parquet(self, *paths, **options):
|
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"""
|
|
Loads Parquet files, returning the result as a :class:`DataFrame`.
|
|
|
|
.. versionadded:: 1.4.0
|
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|
|
Parameters
|
|
----------
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paths : str
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|
|
Other Parameters
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|
----------------
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mergeSchema : str or bool, optional
|
|
sets whether we should merge schemas collected from all
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Parquet part-files. This will override
|
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``spark.sql.parquet.mergeSchema``. The default value is specified in
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``spark.sql.parquet.mergeSchema``.
|
|
pathGlobFilter : str or bool, optional
|
|
an optional glob pattern to only include files with paths matching
|
|
the pattern. The syntax follows `org.apache.hadoop.fs.GlobFilter`.
|
|
It does not change the behavior of
|
|
`partition discovery <https://spark.apache.org/docs/latest/sql-data-sources-parquet.html#partition-discovery>`_. # noqa
|
|
recursiveFileLookup : str or bool, optional
|
|
recursively scan a directory for files. Using this option
|
|
disables
|
|
`partition discovery <https://spark.apache.org/docs/latest/sql-data-sources-parquet.html#partition-discovery>`_. # noqa
|
|
|
|
modification times occurring before the specified time. The provided timestamp
|
|
must be in the following format: YYYY-MM-DDTHH:mm:ss (e.g. 2020-06-01T13:00:00)
|
|
modifiedBefore (batch only) : an optional timestamp to only include files with
|
|
modification times occurring before the specified time. The provided timestamp
|
|
must be in the following format: YYYY-MM-DDTHH:mm:ss (e.g. 2020-06-01T13:00:00)
|
|
modifiedAfter (batch only) : an optional timestamp to only include files with
|
|
modification times occurring after the specified time. The provided timestamp
|
|
must be in the following format: YYYY-MM-DDTHH:mm:ss (e.g. 2020-06-01T13:00:00)
|
|
datetimeRebaseMode : str, optional
|
|
the rebasing mode for the values of the ``DATE``, ``TIMESTAMP_MICROS``,
|
|
``TIMESTAMP_MILLIS`` logical types from the Julian to Proleptic Gregorian calendar.
|
|
|
|
* ``EXCEPTION``: Spark fails in reads of ancient dates/timestamps
|
|
that are ambiguous between the two calendars.
|
|
* ``CORRECTED``: loading of dates/timestamps without rebasing.
|
|
* ``LEGACY``: perform rebasing of ancient dates/timestamps from the Julian
|
|
to Proleptic Gregorian calendar.
|
|
|
|
If None is set, the value of the SQL config
|
|
``spark.sql.parquet.datetimeRebaseModeInRead`` is used by default.
|
|
int96RebaseMode : str, optional
|
|
the rebasing mode for ``INT96`` timestamps from the Julian to
|
|
Proleptic Gregorian calendar.
|
|
|
|
* ``EXCEPTION``: Spark fails in reads of ancient ``INT96`` timestamps
|
|
that are ambiguous between the two calendars.
|
|
* ``CORRECTED``: loading of ``INT96`` timestamps without rebasing.
|
|
* ``LEGACY``: perform rebasing of ancient ``INT96`` timestamps from the Julian
|
|
to Proleptic Gregorian calendar.
|
|
|
|
If None is set, the value of the SQL config
|
|
``spark.sql.parquet.int96RebaseModeInRead`` is used by default.
|
|
|
|
Examples
|
|
--------
|
|
>>> df = spark.read.parquet('python/test_support/sql/parquet_partitioned')
|
|
>>> df.dtypes
|
|
[('name', 'string'), ('year', 'int'), ('month', 'int'), ('day', 'int')]
|
|
"""
|
|
mergeSchema = options.get('mergeSchema', None)
|
|
pathGlobFilter = options.get('pathGlobFilter', None)
|
|
modifiedBefore = options.get('modifiedBefore', None)
|
|
modifiedAfter = options.get('modifiedAfter', None)
|
|
recursiveFileLookup = options.get('recursiveFileLookup', None)
|
|
datetimeRebaseMode = options.get('datetimeRebaseMode', None)
|
|
int96RebaseMode = options.get('int96RebaseMode', None)
|
|
self._set_opts(mergeSchema=mergeSchema, pathGlobFilter=pathGlobFilter,
|
|
recursiveFileLookup=recursiveFileLookup, modifiedBefore=modifiedBefore,
|
|
modifiedAfter=modifiedAfter, datetimeRebaseMode=datetimeRebaseMode,
|
|
int96RebaseMode=int96RebaseMode)
|
|
|
|
return self._df(self._jreader.parquet(_to_seq(self._spark._sc, paths)))
|
|
|
|
def text(self, paths, wholetext=False, lineSep=None, pathGlobFilter=None,
|
|
recursiveFileLookup=None, modifiedBefore=None,
|
|
modifiedAfter=None):
|
|
"""
|
|
Loads text files and returns a :class:`DataFrame` whose schema starts with a
|
|
string column named "value", and followed by partitioned columns if there
|
|
are any.
|
|
The text files must be encoded as UTF-8.
|
|
|
|
By default, each line in the text file is a new row in the resulting DataFrame.
|
|
|
|
.. versionadded:: 1.6.0
|
|
|
|
Parameters
|
|
----------
|
|
paths : str or list
|
|
string, or list of strings, for input path(s).
|
|
wholetext : str or bool, optional
|
|
if true, read each file from input path(s) as a single row.
|
|
lineSep : str, optional
|
|
defines the line separator that should be used for parsing. If None is
|
|
set, it covers all ``\\r``, ``\\r\\n`` and ``\\n``.
|
|
pathGlobFilter : str or bool, optional
|
|
an optional glob pattern to only include files with paths matching
|
|
the pattern. The syntax follows `org.apache.hadoop.fs.GlobFilter`.
|
|
It does not change the behavior of
|
|
`partition discovery <https://spark.apache.org/docs/latest/sql-data-sources-parquet.html#partition-discovery>`_. # noqa
|
|
recursiveFileLookup : str or bool, optional
|
|
recursively scan a directory for files. Using this option disables
|
|
`partition discovery <https://spark.apache.org/docs/latest/sql-data-sources-parquet.html#partition-discovery>`_. # noqa
|
|
|
|
modification times occurring before the specified time. The provided timestamp
|
|
must be in the following format: YYYY-MM-DDTHH:mm:ss (e.g. 2020-06-01T13:00:00)
|
|
modifiedBefore (batch only) : an optional timestamp to only include files with
|
|
modification times occurring before the specified time. The provided timestamp
|
|
must be in the following format: YYYY-MM-DDTHH:mm:ss (e.g. 2020-06-01T13:00:00)
|
|
modifiedAfter (batch only) : an optional timestamp to only include files with
|
|
modification times occurring after the specified time. The provided timestamp
|
|
must be in the following format: YYYY-MM-DDTHH:mm:ss (e.g. 2020-06-01T13:00:00)
|
|
|
|
Examples
|
|
--------
|
|
>>> df = spark.read.text('python/test_support/sql/text-test.txt')
|
|
>>> df.collect()
|
|
[Row(value='hello'), Row(value='this')]
|
|
>>> df = spark.read.text('python/test_support/sql/text-test.txt', wholetext=True)
|
|
>>> df.collect()
|
|
[Row(value='hello\\nthis')]
|
|
"""
|
|
self._set_opts(
|
|
wholetext=wholetext, lineSep=lineSep, pathGlobFilter=pathGlobFilter,
|
|
recursiveFileLookup=recursiveFileLookup, modifiedBefore=modifiedBefore,
|
|
modifiedAfter=modifiedAfter)
|
|
|
|
if isinstance(paths, str):
|
|
paths = [paths]
|
|
return self._df(self._jreader.text(self._spark._sc._jvm.PythonUtils.toSeq(paths)))
|
|
|
|
def csv(self, path, schema=None, sep=None, encoding=None, quote=None, escape=None,
|
|
comment=None, header=None, inferSchema=None, ignoreLeadingWhiteSpace=None,
|
|
ignoreTrailingWhiteSpace=None, nullValue=None, nanValue=None, positiveInf=None,
|
|
negativeInf=None, dateFormat=None, timestampFormat=None, maxColumns=None,
|
|
maxCharsPerColumn=None, maxMalformedLogPerPartition=None, mode=None,
|
|
columnNameOfCorruptRecord=None, multiLine=None, charToEscapeQuoteEscaping=None,
|
|
samplingRatio=None, enforceSchema=None, emptyValue=None, locale=None, lineSep=None,
|
|
pathGlobFilter=None, recursiveFileLookup=None, modifiedBefore=None, modifiedAfter=None,
|
|
unescapedQuoteHandling=None):
|
|
r"""Loads a CSV file and returns the result as a :class:`DataFrame`.
|
|
|
|
This function will go through the input once to determine the input schema if
|
|
``inferSchema`` is enabled. To avoid going through the entire data once, disable
|
|
``inferSchema`` option or specify the schema explicitly using ``schema``.
|
|
|
|
.. versionadded:: 2.0.0
|
|
|
|
Parameters
|
|
----------
|
|
path : str or list
|
|
string, or list of strings, for input path(s),
|
|
or RDD of Strings storing CSV rows.
|
|
schema : :class:`pyspark.sql.types.StructType` or str, optional
|
|
an optional :class:`pyspark.sql.types.StructType` for the input schema
|
|
or a DDL-formatted string (For example ``col0 INT, col1 DOUBLE``).
|
|
sep : str, optional
|
|
sets a separator (one or more characters) for each field and value. If None is
|
|
set, it uses the default value, ``,``.
|
|
encoding : str, optional
|
|
decodes the CSV files by the given encoding type. If None is set,
|
|
it uses the default value, ``UTF-8``.
|
|
quote : str, optional
|
|
sets a single character used for escaping quoted values where the
|
|
separator can be part of the value. If None is set, it uses the default
|
|
value, ``"``. If you would like to turn off quotations, you need to set an
|
|
empty string.
|
|
escape : str, optional
|
|
sets a single character used for escaping quotes inside an already
|
|
quoted value. If None is set, it uses the default value, ``\``.
|
|
comment : str, optional
|
|
sets a single character used for skipping lines beginning with this
|
|
character. By default (None), it is disabled.
|
|
header : str or bool, optional
|
|
uses the first line as names of columns. If None is set, it uses the
|
|
default value, ``false``.
|
|
|
|
.. note:: if the given path is a RDD of Strings, this header
|
|
option will remove all lines same with the header if exists.
|
|
|
|
inferSchema : str or bool, optional
|
|
infers the input schema automatically from data. It requires one extra
|
|
pass over the data. If None is set, it uses the default value, ``false``.
|
|
enforceSchema : str or bool, optional
|
|
If it is set to ``true``, the specified or inferred schema will be
|
|
forcibly applied to datasource files, and headers in CSV files will be
|
|
ignored. If the option is set to ``false``, the schema will be
|
|
validated against all headers in CSV files or the first header in RDD
|
|
if the ``header`` option is set to ``true``. Field names in the schema
|
|
and column names in CSV headers are checked by their positions
|
|
taking into account ``spark.sql.caseSensitive``. If None is set,
|
|
``true`` is used by default. Though the default value is ``true``,
|
|
it is recommended to disable the ``enforceSchema`` option
|
|
to avoid incorrect results.
|
|
ignoreLeadingWhiteSpace : str or bool, optional
|
|
A flag indicating whether or not leading whitespaces from
|
|
values being read should be skipped. If None is set, it
|
|
uses the default value, ``false``.
|
|
ignoreTrailingWhiteSpace : str or bool, optional
|
|
A flag indicating whether or not trailing whitespaces from
|
|
values being read should be skipped. If None is set, it
|
|
uses the default value, ``false``.
|
|
nullValue : str, optional
|
|
sets the string representation of a null value. If None is set, it uses
|
|
the default value, empty string. Since 2.0.1, this ``nullValue`` param
|
|
applies to all supported types including the string type.
|
|
nanValue : str, optional
|
|
sets the string representation of a non-number value. If None is set, it
|
|
uses the default value, ``NaN``.
|
|
positiveInf : str, optional
|
|
sets the string representation of a positive infinity value. If None
|
|
is set, it uses the default value, ``Inf``.
|
|
negativeInf : str, optional
|
|
sets the string representation of a negative infinity value. If None
|
|
is set, it uses the default value, ``Inf``.
|
|
dateFormat : str, optional
|
|
sets the string that indicates a date format. Custom date formats
|
|
follow the formats at
|
|
`datetime pattern <https://spark.apache.org/docs/latest/sql-ref-datetime-pattern.html>`_. # noqa
|
|
This applies to date type. If None is set, it uses the
|
|
default value, ``yyyy-MM-dd``.
|
|
timestampFormat : str, optional
|
|
sets the string that indicates a timestamp format.
|
|
Custom date formats follow the formats at
|
|
`datetime pattern <https://spark.apache.org/docs/latest/sql-ref-datetime-pattern.html>`_. # noqa
|
|
This applies to timestamp type. If None is set, it uses the
|
|
default value, ``yyyy-MM-dd'T'HH:mm:ss[.SSS][XXX]``.
|
|
maxColumns : str or int, optional
|
|
defines a hard limit of how many columns a record can have. If None is
|
|
set, it uses the default value, ``20480``.
|
|
maxCharsPerColumn : str or int, optional
|
|
defines the maximum number of characters allowed for any given
|
|
value being read. If None is set, it uses the default value,
|
|
``-1`` meaning unlimited length.
|
|
maxMalformedLogPerPartition : str or int, optional
|
|
this parameter is no longer used since Spark 2.2.0.
|
|
If specified, it is ignored.
|
|
mode : str, optional
|
|
allows a mode for dealing with corrupt records during parsing. If None is
|
|
set, it uses the default value, ``PERMISSIVE``. Note that Spark tries to
|
|
parse only required columns in CSV under column pruning. Therefore, corrupt
|
|
records can be different based on required set of fields. This behavior can
|
|
be controlled by ``spark.sql.csv.parser.columnPruning.enabled``
|
|
(enabled by default).
|
|
|
|
* ``PERMISSIVE``: when it meets a corrupted record, puts the malformed string \
|
|
into a field configured by ``columnNameOfCorruptRecord``, and sets malformed \
|
|
fields to ``null``. To keep corrupt records, an user can set a string type \
|
|
field named ``columnNameOfCorruptRecord`` in an user-defined schema. If a \
|
|
schema does not have the field, it drops corrupt records during parsing. \
|
|
A record with less/more tokens than schema is not a corrupted record to CSV. \
|
|
When it meets a record having fewer tokens than the length of the schema, \
|
|
sets ``null`` to extra fields. When the record has more tokens than the \
|
|
length of the schema, it drops extra tokens.
|
|
* ``DROPMALFORMED``: ignores the whole corrupted records.
|
|
* ``FAILFAST``: throws an exception when it meets corrupted records.
|
|
|
|
columnNameOfCorruptRecord : str, optional
|
|
allows renaming the new field having malformed string
|
|
created by ``PERMISSIVE`` mode. This overrides
|
|
``spark.sql.columnNameOfCorruptRecord``. If None is set,
|
|
it uses the value specified in
|
|
``spark.sql.columnNameOfCorruptRecord``.
|
|
multiLine : str or bool, optional
|
|
parse records, which may span multiple lines. If None is
|
|
set, it uses the default value, ``false``.
|
|
charToEscapeQuoteEscaping : str, optional
|
|
sets a single character used for escaping the escape for
|
|
the quote character. If None is set, the default value is
|
|
escape character when escape and quote characters are
|
|
different, ``\0`` otherwise.
|
|
samplingRatio : str or float, optional
|
|
defines fraction of rows used for schema inferring.
|
|
If None is set, it uses the default value, ``1.0``.
|
|
emptyValue : str, optional
|
|
sets the string representation of an empty value. If None is set, it uses
|
|
the default value, empty string.
|
|
locale : str, optional
|
|
sets a locale as language tag in IETF BCP 47 format. If None is set,
|
|
it uses the default value, ``en-US``. For instance, ``locale`` is used while
|
|
parsing dates and timestamps.
|
|
lineSep : str, optional
|
|
defines the line separator that should be used for parsing. If None is
|
|
set, it covers all ``\\r``, ``\\r\\n`` and ``\\n``.
|
|
Maximum length is 1 character.
|
|
pathGlobFilter : str or bool, optional
|
|
an optional glob pattern to only include files with paths matching
|
|
the pattern. The syntax follows `org.apache.hadoop.fs.GlobFilter`.
|
|
It does not change the behavior of
|
|
`partition discovery <https://spark.apache.org/docs/latest/sql-data-sources-parquet.html#partition-discovery>`_. # noqa
|
|
recursiveFileLookup : str or bool, optional
|
|
recursively scan a directory for files. Using this option disables
|
|
`partition discovery <https://spark.apache.org/docs/latest/sql-data-sources-parquet.html#partition-discovery>`_. # noqa
|
|
|
|
modification times occurring before the specified time. The provided timestamp
|
|
must be in the following format: YYYY-MM-DDTHH:mm:ss (e.g. 2020-06-01T13:00:00)
|
|
modifiedBefore (batch only) : an optional timestamp to only include files with
|
|
modification times occurring before the specified time. The provided timestamp
|
|
must be in the following format: YYYY-MM-DDTHH:mm:ss (e.g. 2020-06-01T13:00:00)
|
|
modifiedAfter (batch only) : an optional timestamp to only include files with
|
|
modification times occurring after the specified time. The provided timestamp
|
|
must be in the following format: YYYY-MM-DDTHH:mm:ss (e.g. 2020-06-01T13:00:00)
|
|
unescapedQuoteHandling : str, optional
|
|
defines how the CsvParser will handle values with unescaped quotes. If None is
|
|
set, it uses the default value, ``STOP_AT_DELIMITER``.
|
|
|
|
* ``STOP_AT_CLOSING_QUOTE``: If unescaped quotes are found in the input, accumulate
|
|
the quote character and proceed parsing the value as a quoted value, until a closing
|
|
quote is found.
|
|
* ``BACK_TO_DELIMITER``: If unescaped quotes are found in the input, consider the value
|
|
as an unquoted value. This will make the parser accumulate all characters of the current
|
|
parsed value until the delimiter is found. If no delimiter is found in the value, the
|
|
parser will continue accumulating characters from the input until a delimiter or line
|
|
ending is found.
|
|
* ``STOP_AT_DELIMITER``: If unescaped quotes are found in the input, consider the value
|
|
as an unquoted value. This will make the parser accumulate all characters until the
|
|
delimiter or a line ending is found in the input.
|
|
* ``SKIP_VALUE``: If unescaped quotes are found in the input, the content parsed
|
|
for the given value will be skipped and the value set in nullValue will be produced
|
|
instead.
|
|
* ``RAISE_ERROR``: If unescaped quotes are found in the input, a TextParsingException
|
|
will be thrown.
|
|
|
|
Examples
|
|
--------
|
|
>>> df = spark.read.csv('python/test_support/sql/ages.csv')
|
|
>>> df.dtypes
|
|
[('_c0', 'string'), ('_c1', 'string')]
|
|
>>> rdd = sc.textFile('python/test_support/sql/ages.csv')
|
|
>>> df2 = spark.read.csv(rdd)
|
|
>>> df2.dtypes
|
|
[('_c0', 'string'), ('_c1', 'string')]
|
|
"""
|
|
self._set_opts(
|
|
schema=schema, sep=sep, encoding=encoding, quote=quote, escape=escape, comment=comment,
|
|
header=header, inferSchema=inferSchema, ignoreLeadingWhiteSpace=ignoreLeadingWhiteSpace,
|
|
ignoreTrailingWhiteSpace=ignoreTrailingWhiteSpace, nullValue=nullValue,
|
|
nanValue=nanValue, positiveInf=positiveInf, negativeInf=negativeInf,
|
|
dateFormat=dateFormat, timestampFormat=timestampFormat, maxColumns=maxColumns,
|
|
maxCharsPerColumn=maxCharsPerColumn,
|
|
maxMalformedLogPerPartition=maxMalformedLogPerPartition, mode=mode,
|
|
columnNameOfCorruptRecord=columnNameOfCorruptRecord, multiLine=multiLine,
|
|
charToEscapeQuoteEscaping=charToEscapeQuoteEscaping, samplingRatio=samplingRatio,
|
|
enforceSchema=enforceSchema, emptyValue=emptyValue, locale=locale, lineSep=lineSep,
|
|
pathGlobFilter=pathGlobFilter, recursiveFileLookup=recursiveFileLookup,
|
|
modifiedBefore=modifiedBefore, modifiedAfter=modifiedAfter,
|
|
unescapedQuoteHandling=unescapedQuoteHandling)
|
|
if isinstance(path, str):
|
|
path = [path]
|
|
if type(path) == list:
|
|
return self._df(self._jreader.csv(self._spark._sc._jvm.PythonUtils.toSeq(path)))
|
|
elif isinstance(path, RDD):
|
|
def func(iterator):
|
|
for x in iterator:
|
|
if not isinstance(x, str):
|
|
x = str(x)
|
|
if isinstance(x, str):
|
|
x = x.encode("utf-8")
|
|
yield x
|
|
keyed = path.mapPartitions(func)
|
|
keyed._bypass_serializer = True
|
|
jrdd = keyed._jrdd.map(self._spark._jvm.BytesToString())
|
|
# see SPARK-22112
|
|
# There aren't any jvm api for creating a dataframe from rdd storing csv.
|
|
# We can do it through creating a jvm dataset firstly and using the jvm api
|
|
# for creating a dataframe from dataset storing csv.
|
|
jdataset = self._spark._ssql_ctx.createDataset(
|
|
jrdd.rdd(),
|
|
self._spark._jvm.Encoders.STRING())
|
|
return self._df(self._jreader.csv(jdataset))
|
|
else:
|
|
raise TypeError("path can be only string, list or RDD")
|
|
|
|
def orc(self, path, mergeSchema=None, pathGlobFilter=None, recursiveFileLookup=None,
|
|
modifiedBefore=None, modifiedAfter=None):
|
|
"""Loads ORC files, returning the result as a :class:`DataFrame`.
|
|
|
|
.. versionadded:: 1.5.0
|
|
|
|
Parameters
|
|
----------
|
|
path : str or list
|
|
|
|
Other Parameters
|
|
----------------
|
|
Extra options
|
|
For the extra options, refer to
|
|
`Data Source Option <https://spark.apache.org/docs/latest/sql-data-sources-orc.html#data-source-option>`_ # noqa
|
|
in the version you use.
|
|
|
|
Examples
|
|
--------
|
|
>>> df = spark.read.orc('python/test_support/sql/orc_partitioned')
|
|
>>> df.dtypes
|
|
[('a', 'bigint'), ('b', 'int'), ('c', 'int')]
|
|
"""
|
|
self._set_opts(mergeSchema=mergeSchema, pathGlobFilter=pathGlobFilter,
|
|
modifiedBefore=modifiedBefore, modifiedAfter=modifiedAfter,
|
|
recursiveFileLookup=recursiveFileLookup)
|
|
if isinstance(path, str):
|
|
path = [path]
|
|
return self._df(self._jreader.orc(_to_seq(self._spark._sc, path)))
|
|
|
|
def jdbc(self, url, table, column=None, lowerBound=None, upperBound=None, numPartitions=None,
|
|
predicates=None, properties=None):
|
|
"""
|
|
Construct a :class:`DataFrame` representing the database table named ``table``
|
|
accessible via JDBC URL ``url`` and connection ``properties``.
|
|
|
|
Partitions of the table will be retrieved in parallel if either ``column`` or
|
|
``predicates`` is specified. ``lowerBound``, ``upperBound`` and ``numPartitions``
|
|
is needed when ``column`` is specified.
|
|
|
|
If both ``column`` and ``predicates`` are specified, ``column`` will be used.
|
|
|
|
.. versionadded:: 1.4.0
|
|
|
|
Parameters
|
|
----------
|
|
url : str
|
|
a JDBC URL of the form ``jdbc:subprotocol:subname``
|
|
table : str
|
|
the name of the table
|
|
column : str, optional
|
|
the name of a column of numeric, date, or timestamp type
|
|
that will be used for partitioning;
|
|
if this parameter is specified, then ``numPartitions``, ``lowerBound``
|
|
(inclusive), and ``upperBound`` (exclusive) will form partition strides
|
|
for generated WHERE clause expressions used to split the column
|
|
``column`` evenly
|
|
lowerBound : str or int, optional
|
|
the minimum value of ``column`` used to decide partition stride
|
|
upperBound : str or int, optional
|
|
the maximum value of ``column`` used to decide partition stride
|
|
numPartitions : int, optional
|
|
the number of partitions
|
|
predicates : list, optional
|
|
a list of expressions suitable for inclusion in WHERE clauses;
|
|
each one defines one partition of the :class:`DataFrame`
|
|
properties : dict, optional
|
|
a dictionary of JDBC database connection arguments. Normally at
|
|
least properties "user" and "password" with their corresponding values.
|
|
For example { 'user' : 'SYSTEM', 'password' : 'mypassword' }
|
|
|
|
Notes
|
|
-----
|
|
Don't create too many partitions in parallel on a large cluster;
|
|
otherwise Spark might crash your external database systems.
|
|
|
|
Returns
|
|
-------
|
|
:class:`DataFrame`
|
|
"""
|
|
if properties is None:
|
|
properties = dict()
|
|
jprop = JavaClass("java.util.Properties", self._spark._sc._gateway._gateway_client)()
|
|
for k in properties:
|
|
jprop.setProperty(k, properties[k])
|
|
if column is not None:
|
|
assert lowerBound is not None, "lowerBound can not be None when ``column`` is specified"
|
|
assert upperBound is not None, "upperBound can not be None when ``column`` is specified"
|
|
assert numPartitions is not None, \
|
|
"numPartitions can not be None when ``column`` is specified"
|
|
return self._df(self._jreader.jdbc(url, table, column, int(lowerBound), int(upperBound),
|
|
int(numPartitions), jprop))
|
|
if predicates is not None:
|
|
gateway = self._spark._sc._gateway
|
|
jpredicates = utils.toJArray(gateway, gateway.jvm.java.lang.String, predicates)
|
|
return self._df(self._jreader.jdbc(url, table, jpredicates, jprop))
|
|
return self._df(self._jreader.jdbc(url, table, jprop))
|
|
|
|
|
|
class DataFrameWriter(OptionUtils):
|
|
"""
|
|
Interface used to write a :class:`DataFrame` to external storage systems
|
|
(e.g. file systems, key-value stores, etc). Use :attr:`DataFrame.write`
|
|
to access this.
|
|
|
|
.. versionadded:: 1.4
|
|
"""
|
|
def __init__(self, df):
|
|
self._df = df
|
|
self._spark = df.sql_ctx
|
|
self._jwrite = df._jdf.write()
|
|
|
|
def _sq(self, jsq):
|
|
from pyspark.sql.streaming import StreamingQuery
|
|
return StreamingQuery(jsq)
|
|
|
|
def mode(self, saveMode):
|
|
"""Specifies the behavior when data or table already exists.
|
|
|
|
Options include:
|
|
|
|
* `append`: Append contents of this :class:`DataFrame` to existing data.
|
|
* `overwrite`: Overwrite existing data.
|
|
* `error` or `errorifexists`: Throw an exception if data already exists.
|
|
* `ignore`: Silently ignore this operation if data already exists.
|
|
|
|
.. versionadded:: 1.4.0
|
|
|
|
Examples
|
|
--------
|
|
>>> df.write.mode('append').parquet(os.path.join(tempfile.mkdtemp(), 'data'))
|
|
"""
|
|
# At the JVM side, the default value of mode is already set to "error".
|
|
# So, if the given saveMode is None, we will not call JVM-side's mode method.
|
|
if saveMode is not None:
|
|
self._jwrite = self._jwrite.mode(saveMode)
|
|
return self
|
|
|
|
def format(self, source):
|
|
"""Specifies the underlying output data source.
|
|
|
|
.. versionadded:: 1.4.0
|
|
|
|
Parameters
|
|
----------
|
|
source : str
|
|
string, name of the data source, e.g. 'json', 'parquet'.
|
|
|
|
Examples
|
|
--------
|
|
>>> df.write.format('json').save(os.path.join(tempfile.mkdtemp(), 'data'))
|
|
"""
|
|
self._jwrite = self._jwrite.format(source)
|
|
return self
|
|
|
|
@since(1.5)
|
|
def option(self, key, value):
|
|
"""Adds an output option for the underlying data source.
|
|
|
|
You can set the following option(s) for writing files:
|
|
* ``timeZone``: sets the string that indicates a time zone ID to be used to format
|
|
timestamps in the JSON/CSV datasources or partition values. The following
|
|
formats of `timeZone` are supported:
|
|
|
|
* Region-based zone ID: It should have the form 'area/city', such as \
|
|
'America/Los_Angeles'.
|
|
* Zone offset: It should be in the format '(+|-)HH:mm', for example '-08:00' or \
|
|
'+01:00'. Also 'UTC' and 'Z' are supported as aliases of '+00:00'.
|
|
|
|
Other short names like 'CST' are not recommended to use because they can be
|
|
ambiguous. If it isn't set, the current value of the SQL config
|
|
``spark.sql.session.timeZone`` is used by default.
|
|
"""
|
|
self._jwrite = self._jwrite.option(key, to_str(value))
|
|
return self
|
|
|
|
@since(1.4)
|
|
def options(self, **options):
|
|
"""Adds output options for the underlying data source.
|
|
|
|
You can set the following option(s) for writing files:
|
|
* ``timeZone``: sets the string that indicates a time zone ID to be used to format
|
|
timestamps in the JSON/CSV datasources or partition values. The following
|
|
formats of `timeZone` are supported:
|
|
|
|
* Region-based zone ID: It should have the form 'area/city', such as \
|
|
'America/Los_Angeles'.
|
|
* Zone offset: It should be in the format '(+|-)HH:mm', for example '-08:00' or \
|
|
'+01:00'. Also 'UTC' and 'Z' are supported as aliases of '+00:00'.
|
|
|
|
Other short names like 'CST' are not recommended to use because they can be
|
|
ambiguous. If it isn't set, the current value of the SQL config
|
|
``spark.sql.session.timeZone`` is used by default.
|
|
"""
|
|
for k in options:
|
|
self._jwrite = self._jwrite.option(k, to_str(options[k]))
|
|
return self
|
|
|
|
def partitionBy(self, *cols):
|
|
"""Partitions the output by the given columns on the file system.
|
|
|
|
If specified, the output is laid out on the file system similar
|
|
to Hive's partitioning scheme.
|
|
|
|
.. versionadded:: 1.4.0
|
|
|
|
Parameters
|
|
----------
|
|
cols : str or list
|
|
name of columns
|
|
|
|
Examples
|
|
--------
|
|
>>> df.write.partitionBy('year', 'month').parquet(os.path.join(tempfile.mkdtemp(), 'data'))
|
|
"""
|
|
if len(cols) == 1 and isinstance(cols[0], (list, tuple)):
|
|
cols = cols[0]
|
|
self._jwrite = self._jwrite.partitionBy(_to_seq(self._spark._sc, cols))
|
|
return self
|
|
|
|
def bucketBy(self, numBuckets, col, *cols):
|
|
"""Buckets the output by the given columns.If specified,
|
|
the output is laid out on the file system similar to Hive's bucketing scheme.
|
|
|
|
.. versionadded:: 2.3.0
|
|
|
|
Parameters
|
|
----------
|
|
numBuckets : int
|
|
the number of buckets to save
|
|
col : str, list or tuple
|
|
a name of a column, or a list of names.
|
|
cols : str
|
|
additional names (optional). If `col` is a list it should be empty.
|
|
|
|
Notes
|
|
-----
|
|
Applicable for file-based data sources in combination with
|
|
:py:meth:`DataFrameWriter.saveAsTable`.
|
|
|
|
Examples
|
|
--------
|
|
>>> (df.write.format('parquet') # doctest: +SKIP
|
|
... .bucketBy(100, 'year', 'month')
|
|
... .mode("overwrite")
|
|
... .saveAsTable('bucketed_table'))
|
|
"""
|
|
if not isinstance(numBuckets, int):
|
|
raise TypeError("numBuckets should be an int, got {0}.".format(type(numBuckets)))
|
|
|
|
if isinstance(col, (list, tuple)):
|
|
if cols:
|
|
raise ValueError("col is a {0} but cols are not empty".format(type(col)))
|
|
|
|
col, cols = col[0], col[1:]
|
|
|
|
if not all(isinstance(c, str) for c in cols) or not(isinstance(col, str)):
|
|
raise TypeError("all names should be `str`")
|
|
|
|
self._jwrite = self._jwrite.bucketBy(numBuckets, col, _to_seq(self._spark._sc, cols))
|
|
return self
|
|
|
|
def sortBy(self, col, *cols):
|
|
"""Sorts the output in each bucket by the given columns on the file system.
|
|
|
|
.. versionadded:: 2.3.0
|
|
|
|
Parameters
|
|
----------
|
|
col : str, tuple or list
|
|
a name of a column, or a list of names.
|
|
cols : str
|
|
additional names (optional). If `col` is a list it should be empty.
|
|
|
|
Examples
|
|
--------
|
|
>>> (df.write.format('parquet') # doctest: +SKIP
|
|
... .bucketBy(100, 'year', 'month')
|
|
... .sortBy('day')
|
|
... .mode("overwrite")
|
|
... .saveAsTable('sorted_bucketed_table'))
|
|
"""
|
|
if isinstance(col, (list, tuple)):
|
|
if cols:
|
|
raise ValueError("col is a {0} but cols are not empty".format(type(col)))
|
|
|
|
col, cols = col[0], col[1:]
|
|
|
|
if not all(isinstance(c, str) for c in cols) or not(isinstance(col, str)):
|
|
raise TypeError("all names should be `str`")
|
|
|
|
self._jwrite = self._jwrite.sortBy(col, _to_seq(self._spark._sc, cols))
|
|
return self
|
|
|
|
def save(self, path=None, format=None, mode=None, partitionBy=None, **options):
|
|
"""Saves the contents of the :class:`DataFrame` to a data source.
|
|
|
|
The data source is specified by the ``format`` and a set of ``options``.
|
|
If ``format`` is not specified, the default data source configured by
|
|
``spark.sql.sources.default`` will be used.
|
|
|
|
.. versionadded:: 1.4.0
|
|
|
|
Parameters
|
|
----------
|
|
path : str, optional
|
|
the path in a Hadoop supported file system
|
|
format : str, optional
|
|
the format used to save
|
|
mode : str, optional
|
|
specifies the behavior of the save operation when data already exists.
|
|
|
|
* ``append``: Append contents of this :class:`DataFrame` to existing data.
|
|
* ``overwrite``: Overwrite existing data.
|
|
* ``ignore``: Silently ignore this operation if data already exists.
|
|
* ``error`` or ``errorifexists`` (default case): Throw an exception if data already \
|
|
exists.
|
|
partitionBy : list, optional
|
|
names of partitioning columns
|
|
**options : dict
|
|
all other string options
|
|
|
|
Examples
|
|
--------
|
|
>>> df.write.mode("append").save(os.path.join(tempfile.mkdtemp(), 'data'))
|
|
"""
|
|
self.mode(mode).options(**options)
|
|
if partitionBy is not None:
|
|
self.partitionBy(partitionBy)
|
|
if format is not None:
|
|
self.format(format)
|
|
if path is None:
|
|
self._jwrite.save()
|
|
else:
|
|
self._jwrite.save(path)
|
|
|
|
@since(1.4)
|
|
def insertInto(self, tableName, overwrite=None):
|
|
"""Inserts the content of the :class:`DataFrame` to the specified table.
|
|
|
|
It requires that the schema of the :class:`DataFrame` is the same as the
|
|
schema of the table.
|
|
|
|
Optionally overwriting any existing data.
|
|
"""
|
|
if overwrite is not None:
|
|
self.mode("overwrite" if overwrite else "append")
|
|
self._jwrite.insertInto(tableName)
|
|
|
|
def saveAsTable(self, name, format=None, mode=None, partitionBy=None, **options):
|
|
"""Saves the content of the :class:`DataFrame` as the specified table.
|
|
|
|
In the case the table already exists, behavior of this function depends on the
|
|
save mode, specified by the `mode` function (default to throwing an exception).
|
|
When `mode` is `Overwrite`, the schema of the :class:`DataFrame` does not need to be
|
|
the same as that of the existing table.
|
|
|
|
* `append`: Append contents of this :class:`DataFrame` to existing data.
|
|
* `overwrite`: Overwrite existing data.
|
|
* `error` or `errorifexists`: Throw an exception if data already exists.
|
|
* `ignore`: Silently ignore this operation if data already exists.
|
|
|
|
.. versionadded:: 1.4.0
|
|
|
|
Parameters
|
|
----------
|
|
name : str
|
|
the table name
|
|
format : str, optional
|
|
the format used to save
|
|
mode : str, optional
|
|
one of `append`, `overwrite`, `error`, `errorifexists`, `ignore` \
|
|
(default: error)
|
|
partitionBy : str or list
|
|
names of partitioning columns
|
|
**options : dict
|
|
all other string options
|
|
"""
|
|
self.mode(mode).options(**options)
|
|
if partitionBy is not None:
|
|
self.partitionBy(partitionBy)
|
|
if format is not None:
|
|
self.format(format)
|
|
self._jwrite.saveAsTable(name)
|
|
|
|
def json(self, path, mode=None, compression=None, dateFormat=None, timestampFormat=None,
|
|
lineSep=None, encoding=None, ignoreNullFields=None):
|
|
"""Saves the content of the :class:`DataFrame` in JSON format
|
|
(`JSON Lines text format or newline-delimited JSON <http://jsonlines.org/>`_) at the
|
|
specified path.
|
|
|
|
.. versionadded:: 1.4.0
|
|
|
|
Parameters
|
|
----------
|
|
path : str
|
|
the path in any Hadoop supported file system
|
|
mode : str, optional
|
|
specifies the behavior of the save operation when data already exists.
|
|
|
|
* ``append``: Append contents of this :class:`DataFrame` to existing data.
|
|
* ``overwrite``: Overwrite existing data.
|
|
* ``ignore``: Silently ignore this operation if data already exists.
|
|
* ``error`` or ``errorifexists`` (default case): Throw an exception if data already \
|
|
exists.
|
|
compression : str, optional
|
|
compression codec to use when saving to file. This can be one of the
|
|
known case-insensitive shorten names (none, bzip2, gzip, lz4,
|
|
snappy and deflate).
|
|
dateFormat : str, optional
|
|
sets the string that indicates a date format. Custom date formats
|
|
follow the formats at
|
|
`datetime pattern <https://spark.apache.org/docs/latest/sql-ref-datetime-pattern.html>`_. # noqa
|
|
This applies to date type. If None is set, it uses the
|
|
default value, ``yyyy-MM-dd``.
|
|
timestampFormat : str, optional
|
|
sets the string that indicates a timestamp format.
|
|
Custom date formats follow the formats at
|
|
`datetime pattern <https://spark.apache.org/docs/latest/sql-ref-datetime-pattern.html>`_. # noqa
|
|
This applies to timestamp type. If None is set, it uses the
|
|
default value, ``yyyy-MM-dd'T'HH:mm:ss[.SSS][XXX]``.
|
|
encoding : str, optional
|
|
specifies encoding (charset) of saved json files. If None is set,
|
|
the default UTF-8 charset will be used.
|
|
lineSep : str, optional
|
|
defines the line separator that should be used for writing. If None is
|
|
set, it uses the default value, ``\\n``.
|
|
ignoreNullFields : str or bool, optional
|
|
Whether to ignore null fields when generating JSON objects.
|
|
If None is set, it uses the default value, ``true``.
|
|
|
|
Examples
|
|
--------
|
|
>>> df.write.json(os.path.join(tempfile.mkdtemp(), 'data'))
|
|
"""
|
|
self.mode(mode)
|
|
self._set_opts(
|
|
compression=compression, dateFormat=dateFormat, timestampFormat=timestampFormat,
|
|
lineSep=lineSep, encoding=encoding, ignoreNullFields=ignoreNullFields)
|
|
self._jwrite.json(path)
|
|
|
|
def parquet(self, path, mode=None, partitionBy=None, compression=None):
|
|
"""Saves the content of the :class:`DataFrame` in Parquet format at the specified path.
|
|
|
|
.. versionadded:: 1.4.0
|
|
|
|
Parameters
|
|
----------
|
|
path : str
|
|
the path in any Hadoop supported file system
|
|
mode : str, optional
|
|
specifies the behavior of the save operation when data already exists.
|
|
|
|
* ``append``: Append contents of this :class:`DataFrame` to existing data.
|
|
* ``overwrite``: Overwrite existing data.
|
|
* ``ignore``: Silently ignore this operation if data already exists.
|
|
* ``error`` or ``errorifexists`` (default case): Throw an exception if data already \
|
|
exists.
|
|
partitionBy : str or list, optional
|
|
names of partitioning columns
|
|
compression : str, optional
|
|
compression codec to use when saving to file. This can be one of the
|
|
known case-insensitive shorten names (none, uncompressed, snappy, gzip,
|
|
lzo, brotli, lz4, and zstd). This will override
|
|
``spark.sql.parquet.compression.codec``. If None is set, it uses the
|
|
value specified in ``spark.sql.parquet.compression.codec``.
|
|
|
|
Examples
|
|
--------
|
|
>>> df.write.parquet(os.path.join(tempfile.mkdtemp(), 'data'))
|
|
"""
|
|
self.mode(mode)
|
|
if partitionBy is not None:
|
|
self.partitionBy(partitionBy)
|
|
self._set_opts(compression=compression)
|
|
self._jwrite.parquet(path)
|
|
|
|
def text(self, path, compression=None, lineSep=None):
|
|
"""Saves the content of the DataFrame in a text file at the specified path.
|
|
The text files will be encoded as UTF-8.
|
|
|
|
.. versionadded:: 1.6.0
|
|
|
|
Parameters
|
|
----------
|
|
path : str
|
|
the path in any Hadoop supported file system
|
|
compression : str, optional
|
|
compression codec to use when saving to file. This can be one of the
|
|
known case-insensitive shorten names (none, bzip2, gzip, lz4,
|
|
snappy and deflate).
|
|
lineSep : str, optional
|
|
defines the line separator that should be used for writing. If None is
|
|
set, it uses the default value, ``\\n``.
|
|
|
|
The DataFrame must have only one column that is of string type.
|
|
Each row becomes a new line in the output file.
|
|
"""
|
|
self._set_opts(compression=compression, lineSep=lineSep)
|
|
self._jwrite.text(path)
|
|
|
|
def csv(self, path, mode=None, compression=None, sep=None, quote=None, escape=None,
|
|
header=None, nullValue=None, escapeQuotes=None, quoteAll=None, dateFormat=None,
|
|
timestampFormat=None, ignoreLeadingWhiteSpace=None, ignoreTrailingWhiteSpace=None,
|
|
charToEscapeQuoteEscaping=None, encoding=None, emptyValue=None, lineSep=None):
|
|
r"""Saves the content of the :class:`DataFrame` in CSV format at the specified path.
|
|
|
|
.. versionadded:: 2.0.0
|
|
|
|
Parameters
|
|
----------
|
|
path : str
|
|
the path in any Hadoop supported file system
|
|
mode : str, optional
|
|
specifies the behavior of the save operation when data already exists.
|
|
|
|
* ``append``: Append contents of this :class:`DataFrame` to existing data.
|
|
* ``overwrite``: Overwrite existing data.
|
|
* ``ignore``: Silently ignore this operation if data already exists.
|
|
* ``error`` or ``errorifexists`` (default case): Throw an exception if data already \
|
|
exists.
|
|
|
|
compression : str, optional
|
|
compression codec to use when saving to file. This can be one of the
|
|
known case-insensitive shorten names (none, bzip2, gzip, lz4,
|
|
snappy and deflate).
|
|
sep : str, optional
|
|
sets a separator (one or more characters) for each field and value. If None is
|
|
set, it uses the default value, ``,``.
|
|
quote : str, optional
|
|
sets a single character used for escaping quoted values where the
|
|
separator can be part of the value. If None is set, it uses the default
|
|
value, ``"``. If an empty string is set, it uses ``u0000`` (null character).
|
|
escape : str, optional
|
|
sets a single character used for escaping quotes inside an already
|
|
quoted value. If None is set, it uses the default value, ``\``
|
|
escapeQuotes : str or bool, optional
|
|
a flag indicating whether values containing quotes should always
|
|
be enclosed in quotes. If None is set, it uses the default value
|
|
``true``, escaping all values containing a quote character.
|
|
quoteAll : str or bool, optional
|
|
a flag indicating whether all values should always be enclosed in
|
|
quotes. If None is set, it uses the default value ``false``,
|
|
only escaping values containing a quote character.
|
|
header : str or bool, optional
|
|
writes the names of columns as the first line. If None is set, it uses
|
|
the default value, ``false``.
|
|
nullValue : str, optional
|
|
sets the string representation of a null value. If None is set, it uses
|
|
the default value, empty string.
|
|
dateFormat : str, optional
|
|
sets the string that indicates a date format. Custom date formats follow
|
|
the formats at
|
|
`datetime pattern <https://spark.apache.org/docs/latest/sql-ref-datetime-pattern.html>`_. # noqa
|
|
This applies to date type. If None is set, it uses the
|
|
default value, ``yyyy-MM-dd``.
|
|
timestampFormat : str, optional
|
|
sets the string that indicates a timestamp format.
|
|
Custom date formats follow the formats at
|
|
`datetime pattern <https://spark.apache.org/docs/latest/sql-ref-datetime-pattern.html>`_. # noqa
|
|
This applies to timestamp type. If None is set, it uses the
|
|
default value, ``yyyy-MM-dd'T'HH:mm:ss[.SSS][XXX]``.
|
|
ignoreLeadingWhiteSpace : str or bool, optional
|
|
a flag indicating whether or not leading whitespaces from
|
|
values being written should be skipped. If None is set, it
|
|
uses the default value, ``true``.
|
|
ignoreTrailingWhiteSpace : str or bool, optional
|
|
a flag indicating whether or not trailing whitespaces from
|
|
values being written should be skipped. If None is set, it
|
|
uses the default value, ``true``.
|
|
charToEscapeQuoteEscaping : str, optional
|
|
sets a single character used for escaping the escape for
|
|
the quote character. If None is set, the default value is
|
|
escape character when escape and quote characters are
|
|
different, ``\0`` otherwise..
|
|
encoding : str, optional
|
|
sets the encoding (charset) of saved csv files. If None is set,
|
|
the default UTF-8 charset will be used.
|
|
emptyValue : str, optional
|
|
sets the string representation of an empty value. If None is set, it uses
|
|
the default value, ``""``.
|
|
lineSep : str, optional
|
|
defines the line separator that should be used for writing. If None is
|
|
set, it uses the default value, ``\\n``. Maximum length is 1 character.
|
|
|
|
Examples
|
|
--------
|
|
>>> df.write.csv(os.path.join(tempfile.mkdtemp(), 'data'))
|
|
"""
|
|
self.mode(mode)
|
|
self._set_opts(compression=compression, sep=sep, quote=quote, escape=escape, header=header,
|
|
nullValue=nullValue, escapeQuotes=escapeQuotes, quoteAll=quoteAll,
|
|
dateFormat=dateFormat, timestampFormat=timestampFormat,
|
|
ignoreLeadingWhiteSpace=ignoreLeadingWhiteSpace,
|
|
ignoreTrailingWhiteSpace=ignoreTrailingWhiteSpace,
|
|
charToEscapeQuoteEscaping=charToEscapeQuoteEscaping,
|
|
encoding=encoding, emptyValue=emptyValue, lineSep=lineSep)
|
|
self._jwrite.csv(path)
|
|
|
|
def orc(self, path, mode=None, partitionBy=None, compression=None):
|
|
"""Saves the content of the :class:`DataFrame` in ORC format at the specified path.
|
|
|
|
.. versionadded:: 1.5.0
|
|
|
|
Parameters
|
|
----------
|
|
path : str
|
|
the path in any Hadoop supported file system
|
|
mode : str, optional
|
|
specifies the behavior of the save operation when data already exists.
|
|
|
|
* ``append``: Append contents of this :class:`DataFrame` to existing data.
|
|
* ``overwrite``: Overwrite existing data.
|
|
* ``ignore``: Silently ignore this operation if data already exists.
|
|
* ``error`` or ``errorifexists`` (default case): Throw an exception if data already \
|
|
exists.
|
|
partitionBy : str or list, optional
|
|
names of partitioning columns
|
|
|
|
Other Parameters
|
|
----------------
|
|
Extra options
|
|
For the extra options, refer to
|
|
`Data Source Option <https://spark.apache.org/docs/latest/sql-data-sources-orc.html#data-source-option>`_ # noqa
|
|
in the version you use.
|
|
|
|
Examples
|
|
--------
|
|
>>> orc_df = spark.read.orc('python/test_support/sql/orc_partitioned')
|
|
>>> orc_df.write.orc(os.path.join(tempfile.mkdtemp(), 'data'))
|
|
"""
|
|
self.mode(mode)
|
|
if partitionBy is not None:
|
|
self.partitionBy(partitionBy)
|
|
self._set_opts(compression=compression)
|
|
self._jwrite.orc(path)
|
|
|
|
def jdbc(self, url, table, mode=None, properties=None):
|
|
"""Saves the content of the :class:`DataFrame` to an external database table via JDBC.
|
|
|
|
.. versionadded:: 1.4.0
|
|
|
|
Parameters
|
|
----------
|
|
url : str
|
|
a JDBC URL of the form ``jdbc:subprotocol:subname``
|
|
table : str
|
|
Name of the table in the external database.
|
|
mode : str, optional
|
|
specifies the behavior of the save operation when data already exists.
|
|
|
|
* ``append``: Append contents of this :class:`DataFrame` to existing data.
|
|
* ``overwrite``: Overwrite existing data.
|
|
* ``ignore``: Silently ignore this operation if data already exists.
|
|
* ``error`` or ``errorifexists`` (default case): Throw an exception if data already \
|
|
exists.
|
|
properties : dict
|
|
a dictionary of JDBC database connection arguments. Normally at
|
|
least properties "user" and "password" with their corresponding values.
|
|
For example { 'user' : 'SYSTEM', 'password' : 'mypassword' }
|
|
|
|
Notes
|
|
-----
|
|
Don't create too many partitions in parallel on a large cluster;
|
|
otherwise Spark might crash your external database systems.
|
|
"""
|
|
if properties is None:
|
|
properties = dict()
|
|
jprop = JavaClass("java.util.Properties", self._spark._sc._gateway._gateway_client)()
|
|
for k in properties:
|
|
jprop.setProperty(k, properties[k])
|
|
self.mode(mode)._jwrite.jdbc(url, table, jprop)
|
|
|
|
|
|
class DataFrameWriterV2(object):
|
|
"""
|
|
Interface used to write a class:`pyspark.sql.dataframe.DataFrame`
|
|
to external storage using the v2 API.
|
|
|
|
.. versionadded:: 3.1.0
|
|
"""
|
|
|
|
def __init__(self, df, table):
|
|
self._df = df
|
|
self._spark = df.sql_ctx
|
|
self._jwriter = df._jdf.writeTo(table)
|
|
|
|
@since(3.1)
|
|
def using(self, provider):
|
|
"""
|
|
Specifies a provider for the underlying output data source.
|
|
Spark's default catalog supports "parquet", "json", etc.
|
|
"""
|
|
self._jwriter.using(provider)
|
|
return self
|
|
|
|
@since(3.1)
|
|
def option(self, key, value):
|
|
"""
|
|
Add a write option.
|
|
"""
|
|
self._jwriter.option(key, to_str(value))
|
|
return self
|
|
|
|
@since(3.1)
|
|
def options(self, **options):
|
|
"""
|
|
Add write options.
|
|
"""
|
|
options = {k: to_str(v) for k, v in options.items()}
|
|
self._jwriter.options(options)
|
|
return self
|
|
|
|
@since(3.1)
|
|
def tableProperty(self, property, value):
|
|
"""
|
|
Add table property.
|
|
"""
|
|
self._jwriter.tableProperty(property, value)
|
|
return self
|
|
|
|
@since(3.1)
|
|
def partitionedBy(self, col, *cols):
|
|
"""
|
|
Partition the output table created by `create`, `createOrReplace`, or `replace` using
|
|
the given columns or transforms.
|
|
|
|
When specified, the table data will be stored by these values for efficient reads.
|
|
|
|
For example, when a table is partitioned by day, it may be stored
|
|
in a directory layout like:
|
|
|
|
* `table/day=2019-06-01/`
|
|
* `table/day=2019-06-02/`
|
|
|
|
Partitioning is one of the most widely used techniques to optimize physical data layout.
|
|
It provides a coarse-grained index for skipping unnecessary data reads when queries have
|
|
predicates on the partitioned columns. In order for partitioning to work well, the number
|
|
of distinct values in each column should typically be less than tens of thousands.
|
|
|
|
`col` and `cols` support only the following functions:
|
|
|
|
* :py:func:`pyspark.sql.functions.years`
|
|
* :py:func:`pyspark.sql.functions.months`
|
|
* :py:func:`pyspark.sql.functions.days`
|
|
* :py:func:`pyspark.sql.functions.hours`
|
|
* :py:func:`pyspark.sql.functions.bucket`
|
|
|
|
"""
|
|
col = _to_java_column(col)
|
|
cols = _to_seq(self._spark._sc, [_to_java_column(c) for c in cols])
|
|
return self
|
|
|
|
@since(3.1)
|
|
def create(self):
|
|
"""
|
|
Create a new table from the contents of the data frame.
|
|
|
|
The new table's schema, partition layout, properties, and other configuration will be
|
|
based on the configuration set on this writer.
|
|
"""
|
|
self._jwriter.create()
|
|
|
|
@since(3.1)
|
|
def replace(self):
|
|
"""
|
|
Replace an existing table with the contents of the data frame.
|
|
|
|
The existing table's schema, partition layout, properties, and other configuration will be
|
|
replaced with the contents of the data frame and the configuration set on this writer.
|
|
"""
|
|
self._jwriter.replace()
|
|
|
|
@since(3.1)
|
|
def createOrReplace(self):
|
|
"""
|
|
Create a new table or replace an existing table with the contents of the data frame.
|
|
|
|
The output table's schema, partition layout, properties,
|
|
and other configuration will be based on the contents of the data frame
|
|
and the configuration set on this writer.
|
|
If the table exists, its configuration and data will be replaced.
|
|
"""
|
|
self._jwriter.createOrReplace()
|
|
|
|
@since(3.1)
|
|
def append(self):
|
|
"""
|
|
Append the contents of the data frame to the output table.
|
|
"""
|
|
self._jwriter.append()
|
|
|
|
@since(3.1)
|
|
def overwrite(self, condition):
|
|
"""
|
|
Overwrite rows matching the given filter condition with the contents of the data frame in
|
|
the output table.
|
|
"""
|
|
self._jwriter.overwrite(condition)
|
|
|
|
@since(3.1)
|
|
def overwritePartitions(self):
|
|
"""
|
|
Overwrite all partition for which the data frame contains at least one row with the contents
|
|
of the data frame in the output table.
|
|
|
|
This operation is equivalent to Hive's `INSERT OVERWRITE ... PARTITION`, which replaces
|
|
partitions dynamically depending on the contents of the data frame.
|
|
"""
|
|
self._jwriter.overwritePartitions()
|
|
|
|
|
|
def _test():
|
|
import doctest
|
|
import os
|
|
import tempfile
|
|
import py4j
|
|
from pyspark.context import SparkContext
|
|
from pyspark.sql import SparkSession
|
|
import pyspark.sql.readwriter
|
|
|
|
os.chdir(os.environ["SPARK_HOME"])
|
|
|
|
globs = pyspark.sql.readwriter.__dict__.copy()
|
|
sc = SparkContext('local[4]', 'PythonTest')
|
|
try:
|
|
spark = SparkSession.builder.getOrCreate()
|
|
except py4j.protocol.Py4JError:
|
|
spark = SparkSession(sc)
|
|
|
|
globs['tempfile'] = tempfile
|
|
globs['os'] = os
|
|
globs['sc'] = sc
|
|
globs['spark'] = spark
|
|
globs['df'] = spark.read.parquet('python/test_support/sql/parquet_partitioned')
|
|
(failure_count, test_count) = doctest.testmod(
|
|
pyspark.sql.readwriter, globs=globs,
|
|
optionflags=doctest.ELLIPSIS | doctest.NORMALIZE_WHITESPACE | doctest.REPORT_NDIFF)
|
|
sc.stop()
|
|
if failure_count:
|
|
sys.exit(-1)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
_test()
|