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Maxim Gekk 3121b411f7 [SPARK-23846][SQL] The samplingRatio option for CSV datasource 
## What changes were proposed in this pull request?

I propose to support the `samplingRatio` option for schema inferring of CSV datasource similar to the same option of JSON datasource:
b14993e1fc/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/json/JSONOptions.scala (L49-L50)

## How was this patch tested?

Added 2 tests for json and 2 tests for csv datasources. The tests checks that only subset of input dataset is used for schema inferring.

Author: Maxim Gekk <maxim.gekk@databricks.com>
Author: Maxim Gekk <max.gekk@gmail.com>

Closes #20959 from MaxGekk/csv-sampling.
2018-04-30 09:45:22 +08:00
..
ml [SPARK-24044][PYTHON] Explicitly print out skipped tests from unittest module 2018-04-26 15:11:42 -07:00
mllib [SPARK-24044][PYTHON] Explicitly print out skipped tests from unittest module 2018-04-26 15:11:42 -07:00
sql [SPARK-23846][SQL] The samplingRatio option for CSV datasource 2018-04-30 09:45:22 +08:00
streaming [SPARK-24044][PYTHON] Explicitly print out skipped tests from unittest module 2018-04-26 15:11:42 -07:00
__init__.py [SPARK-23328][PYTHON] Disallow default value None in na.replace/replace when 'to_replace' is not a dictionary 2018-02-09 14:21:10 +08:00
_globals.py [SPARK-23328][PYTHON] Disallow default value None in na.replace/replace when 'to_replace' is not a dictionary 2018-02-09 14:21:10 +08:00
accumulators.py [SPARK-23522][PYTHON] always use sys.exit over builtin exit 2018-03-08 20:38:34 +09:00
broadcast.py [SPARK-23522][PYTHON] always use sys.exit over builtin exit 2018-03-08 20:38:34 +09:00
cloudpickle.py [SPARK-23159][PYTHON] Update cloudpickle to v0.4.3 2018-03-08 20:19:55 +09:00
conf.py [SPARK-23522][PYTHON] always use sys.exit over builtin exit 2018-03-08 20:38:34 +09:00
context.py [SPARK-23522][PYTHON] always use sys.exit over builtin exit 2018-03-08 20:38:34 +09:00
daemon.py [SPARK-23522][PYTHON] always use sys.exit over builtin exit 2018-03-08 20:38:34 +09:00
files.py [SPARK-3309] [PySpark] Put all public API in __all__ 2014-09-03 11:49:45 -07:00
find_spark_home.py [SPARK-23522][PYTHON] always use sys.exit over builtin exit 2018-03-08 20:38:34 +09:00
heapq3.py [SPARK-23522][PYTHON] always use sys.exit over builtin exit 2018-03-08 20:38:34 +09:00
java_gateway.py [SPARK-20791][PYSPARK] Use Arrow to create Spark DataFrame from Pandas 2017-11-13 13:16:01 +09:00
join.py [SPARK-14202] [PYTHON] Use generator expression instead of list comp in python_full_outer_jo… 2016-03-28 14:51:36 -07:00
profiler.py [SPARK-23522][PYTHON] always use sys.exit over builtin exit 2018-03-08 20:38:34 +09:00
rdd.py [SPARK-23522][PYTHON] always use sys.exit over builtin exit 2018-03-08 20:38:34 +09:00
rddsampler.py [SPARK-4897] [PySpark] Python 3 support 2015-04-16 16:20:57 -07:00
resultiterable.py [SPARK-3074] [PySpark] support groupByKey() with single huge key 2015-04-09 17:07:23 -07:00
serializers.py [SPARK-23522][PYTHON] always use sys.exit over builtin exit 2018-03-08 20:38:34 +09:00
shell.py [SPARK-19570][PYSPARK] Allow to disable hive in pyspark shell 2017-04-12 10:54:50 -07:00
shuffle.py [SPARK-23522][PYTHON] always use sys.exit over builtin exit 2018-03-08 20:38:34 +09:00
statcounter.py [SPARK-6919] [PYSPARK] Add asDict method to StatCounter 2015-09-29 13:38:15 -07:00
status.py [SPARK-4172] [PySpark] Progress API in Python 2015-02-17 13:36:43 -08:00
storagelevel.py [SPARK-13992][CORE][PYSPARK][FOLLOWUP] Update OFF_HEAP semantics for Java api and Python api 2016-04-12 23:06:55 -07:00
taskcontext.py [SPARK-18576][PYTHON] Add basic TaskContext information to PySpark 2016-12-20 15:51:21 -08:00
tests.py [SPARK-24044][PYTHON] Explicitly print out skipped tests from unittest module 2018-04-26 15:11:42 -07:00
traceback_utils.py [SPARK-1087] Move python traceback utilities into new traceback_utils.py file. 2014-09-15 19:28:17 -07:00
util.py [SPARK-23700][PYTHON] Cleanup imports in pyspark.sql 2018-03-26 12:42:32 +09:00
version.py [SPARK-23028] Bump master branch version to 2.4.0-SNAPSHOT 2018-01-13 00:37:59 +08:00
worker.py [SPARK-23522][PYTHON] always use sys.exit over builtin exit 2018-03-08 20:38:34 +09:00