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HyukjinKwon 01e9dd9050 [SPARK-20680][SQL][FOLLOW-UP] Revert NullType.simpleString from 'unknown' to 'null' 
### What changes were proposed in this pull request?

This PR proposes to partially reverts the simple string in `NullType` at https://github.com/apache/spark/pull/28833: `NullType.simpleString` back from `unknown` to `null`.

### Why are the changes needed?

- Technically speaking, it's orthogonal with the issue itself, SPARK-20680.
- It needs some more discussion, see https://github.com/apache/spark/pull/28833#issuecomment-655277714

### Does this PR introduce _any_ user-facing change?

It reverts back the user-facing changes at https://github.com/apache/spark/pull/28833.
The simple string of `NullType` is back to `null`.

### How was this patch tested?

I just logically reverted. Jenkins should test it out.

Closes #29041 from HyukjinKwon/SPARK-20680.

Authored-by: HyukjinKwon <gurwls223@apache.org>
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>
2020-07-09 19:44:08 -07:00
..
ml [SPARK-23631][ML][PYSPARK] Add summary to RandomForestClassificationModel 2020-07-01 08:09:07 -05:00
mllib [SPARK-31966][ML][TESTS][PYTHON] Increase the timeout for StreamingLogisticRegressionWithSGDTests.test_training_and_prediction 2020-06-10 21:56:35 -07:00
resource [SPARK-31748][PYTHON] Document resource module in PySpark doc and rename/move classes 2020-05-19 17:09:37 -07:00
sql [SPARK-20680][SQL][FOLLOW-UP] Revert NullType.simpleString from 'unknown' to 'null' 2020-07-09 19:44:08 -07:00
streaming [SPARK-31788][CORE][DSTREAM][PYTHON] Recover the support of union for different types of RDD and DStreams 2020-06-01 09:43:03 +09:00
testing [SPARK-30434][PYTHON][SQL] Move pandas related functionalities into 'pandas' sub-package 2020-01-09 10:22:50 +09:00
tests [SPARK-32160][CORE][PYSPARK] Disallow to create SparkContext in executors 2020-07-09 15:51:56 +09:00
__init__.py [SPARK-31767][PYTHON][CORE] Remove ResourceInformation in pyspark module's namespace 2020-05-19 22:36:36 -07:00
_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-29341][PYTHON] Upgrade cloudpickle to 1.0.0 2019-10-03 19:20:51 +09:00
cloudpickle.py [SPARK-29536][PYTHON] Upgrade cloudpickle to 1.1.1 to support Python 3.8 2019-10-22 16:18:34 +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-32160][CORE][PYSPARK] Disallow to create SparkContext in executors 2020-07-09 15:51:56 +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 [SPARK-31382][BUILD] Show a better error message for different python and pip installation mistake 2020-04-09 11:04:35 +09:00
heapq3.py Fix typos detected by github.com/client9/misspell 2018-08-11 21:23:36 -05:00
java_gateway.py [SPARK-29641][PYTHON][CORE] Stage Level Sched: Add python api's and tests 2020-04-23 10:20:39 +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 [SPARK-31748][PYTHON] Document resource module in PySpark doc and rename/move classes 2020-05-19 17:09:37 -07:00
rddsampler.py [SPARK-4897] [PySpark] Python 3 support 2015-04-16 16:20:57 -07:00
resultiterable.py [SPARK-30205][PYSPARK] Import ABCs from collections.abc to remove deprecation warnings 2019-12-10 11:08:13 -08:00
serializers.py [SPARK-30434][PYTHON][SQL] Move pandas related functionalities into 'pandas' sub-package 2020-01-09 10:22:50 +09:00
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-31344][CORE] Polish implementation of barrier() and allGather() 2020-04-16 21:23:32 -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-32011][PYTHON][CORE] Remove warnings about pin-thread modes and guide to use collectWithJobGroup 2020-06-17 12:10:12 +09:00
version.py [SPARK-30950][BUILD] Setting version to 3.1.0-SNAPSHOT 2020-02-25 19:44:31 -08:00
worker.py [SPARK-31748][PYTHON] Document resource module in PySpark doc and rename/move classes 2020-05-19 17:09:37 -07:00