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Gengliang Wang 48adc91057 [SPARK-28698][SQL] Support user-specified output schema in to_avro 
## What changes were proposed in this pull request?

The mapping of Spark schema to Avro schema is many-to-many. (See https://spark.apache.org/docs/latest/sql-data-sources-avro.html#supported-types-for-spark-sql---avro-conversion)
The default schema mapping might not be exactly what users want. For example, by default, a "string" column is always written as "string" Avro type, but users might want to output the column as "enum" Avro type.
With PR https://github.com/apache/spark/pull/21847, Spark supports user-specified schema in the batch writer.
For the function `to_avro`, we should support user-specified output schema as well.

## How was this patch tested?

Unit test.

Closes #25419 from gengliangwang/to_avro.

Authored-by: Gengliang Wang <gengliang.wang@databricks.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
2019-08-13 20:52:16 +08:00
..
ml [SPARK-23469][ML] HashingTF should use corrected MurmurHash3 implementation 2019-08-02 10:53:36 -05:00
mllib [SPARK-28140][MLLIB][PYTHON] Accept DataFrames in RowMatrix and IndexedRowMatrix constructors 2019-07-09 16:39:21 -05:00
sql [SPARK-28698][SQL] Support user-specified output schema in to_avro 2019-08-13 20:52:16 +08:00
streaming [SPARK-28206][PYTHON] Remove the legacy Epydoc in PySpark API documentation 2019-07-05 10:08:22 -07:00
testing [SPARK-28206][PYTHON] Remove the legacy Epydoc in PySpark API documentation 2019-07-05 10:08:22 -07:00
tests [SPARK-27371][CORE] Support GPU-aware resources scheduling in Standalone 2019-08-09 07:49:03 -05:00
__init__.py [SPARK-28234][CORE][PYTHON] Add python and JavaSparkContext support to get resources 2019-07-11 09:32:58 +09:00
_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-28206][PYTHON] Remove the legacy Epydoc in PySpark API documentation 2019-07-05 10:08:22 -07:00
broadcast.py [SPARK-28206][PYTHON] Remove the legacy Epydoc in PySpark API documentation 2019-07-05 10:08:22 -07:00
cloudpickle.py [SPARK-27000][PYTHON] Upgrades cloudpickle to v0.8.0 2019-02-28 02:33:10 +09:00
conf.py [SPARK-28206][PYTHON] Remove the legacy Epydoc in PySpark API documentation 2019-07-05 10:08:22 -07:00
context.py [SPARK-28234][CORE][PYTHON] Add python and JavaSparkContext support to get resources 2019-07-11 09:32:58 +09:00
daemon.py [SPARK-26175][PYTHON] Redirect the standard input of the forked child to devnull in daemon 2019-07-31 09:10:24 +09:00
files.py [SPARK-28206][PYTHON] Remove the legacy Epydoc in PySpark API documentation 2019-07-05 10:08:22 -07:00
find_spark_home.py Fix typos detected by github.com/client9/misspell 2018-08-11 21:23:36 -05:00
heapq3.py Fix typos detected by github.com/client9/misspell 2018-08-11 21:23:36 -05:00
java_gateway.py [SPARK-27870][SQL][PYTHON] Add a runtime buffer size configuration for Pandas UDFs 2019-06-15 20:56:22 +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-26640][CORE][ML][SQL][STREAMING][PYSPARK] Code cleanup from lgtm.com analysis 2019-01-17 19:40:39 -06:00
rdd.py [MINOR][PYTHON] Use _memory_limit to get worker memory conf in rdd.py 2019-07-27 11:58:50 -07:00
rddsampler.py [SPARK-4897] [PySpark] Python 3 support 2015-04-16 16:20:57 -07:00
resourceinformation.py [SPARK-28234][CORE][PYTHON] Add python and JavaSparkContext support to get resources 2019-07-11 09:32:58 +09:00
resultiterable.py [SPARK-3074] [PySpark] support groupByKey() with single huge key 2015-04-09 17:07:23 -07:00
serializers.py [SPARK-28206][PYTHON] Remove the legacy Epydoc in PySpark API documentation 2019-07-05 10:08:22 -07:00
shell.py [SPARK-25238][PYTHON] lint-python: Fix W605 warnings for pycodestyle 2.4 2018-09-13 11:19:43 +08:00
shuffle.py [SPARK-25696] The storage memory displayed on spark Application UI is… 2018-12-10 18:27:01 -06:00
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-25908][CORE][SQL] Remove old deprecated items in Spark 3 2018-11-07 22:48:50 -06:00
taskcontext.py [SPARK-28234][CORE][PYTHON] Add python and JavaSparkContext support to get resources 2019-07-11 09:32:58 +09:00
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-26856][PYSPARK] Python support for from_avro and to_avro APIs 2019-03-11 10:15:07 +09:00
version.py [SPARK-25592] Setting version to 3.0.0-SNAPSHOT 2018-10-02 08:48:24 -07:00
worker.py [SPARK-28234][CORE][PYTHON] Add python and JavaSparkContext support to get resources 2019-07-11 09:32:58 +09:00