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Tianshi Zhu 44a5258ac2 [SPARK-31525][SQL] Return an empty list for df.head() when df is empty 
### What changes were proposed in this pull request?

return an empty list instead of None when calling `df.head()`

### Why are the changes needed?

`df.head()` and `df.head(1)` are inconsistent when df is empty.

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

Yes. If a user relies on `df.head()` to return None, things like `if df.head() is None:` will be broken.

### How was this patch tested?

Closes #29214 from tianshizz/SPARK-31525.

Authored-by: Tianshi Zhu <zhutianshirea@gmail.com>
Signed-off-by: HyukjinKwon <gurwls223@apache.org>
2020-07-28 12:32:19 +09:00
..
cloudpickle [SPARK-32094][PYTHON] Update cloudpickle to v1.5.0 2020-07-17 11:49:18 +09:00
ml [SPARK-32310][ML][PYSPARK] ML params default value parity in classification, regression, clustering and fpm 2020-07-16 11:12:29 -07:00
mllib [SPARK-32138] Drop Python 2.7, 3.4 and 3.5 2020-07-14 11:22:44 +09:00
resource [SPARK-30794][CORE] Stage Level scheduling: Add ability to set off heap memory 2020-07-27 08:16:13 -05:00
sql [SPARK-31525][SQL] Return an empty list for df.head() when df is empty 2020-07-28 12:32:19 +09:00
streaming [SPARK-32138] Drop Python 2.7, 3.4 and 3.5 2020-07-14 11:22:44 +09:00
testing [SPARK-32138] Drop Python 2.7, 3.4 and 3.5 2020-07-14 11:22:44 +09:00
tests [SPARK-32138] Drop Python 2.7, 3.4 and 3.5 2020-07-14 11:22:44 +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-32138] Drop Python 2.7, 3.4 and 3.5 2020-07-14 11:22:44 +09:00
broadcast.py [SPARK-32138] Drop Python 2.7, 3.4 and 3.5 2020-07-14 11:22:44 +09:00
conf.py [SPARK-32138] Drop Python 2.7, 3.4 and 3.5 2020-07-14 11:22:44 +09:00
context.py [SPARK-32138] Drop Python 2.7, 3.4 and 3.5 2020-07-14 11:22:44 +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-29802][BUILD] Use python3 in build scripts 2020-07-19 11:02:37 +09:00
java_gateway.py [SPARK-32138] Drop Python 2.7, 3.4 and 3.5 2020-07-14 11:22:44 +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-32138] Drop Python 2.7, 3.4 and 3.5 2020-07-14 11:22:44 +09:00
rddsampler.py [SPARK-4897] [PySpark] Python 3 support 2015-04-16 16:20:57 -07:00
resultiterable.py [SPARK-32138] Drop Python 2.7, 3.4 and 3.5 2020-07-14 11:22:44 +09:00
serializers.py [SPARK-32138] Drop Python 2.7, 3.4 and 3.5 2020-07-14 11:22:44 +09:00
shell.py [SPARK-32138] Drop Python 2.7, 3.4 and 3.5 2020-07-14 11:22:44 +09:00
shuffle.py [SPARK-32435][PYTHON] Remove heapq3 port from Python 3 2020-07-27 20:10:13 +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-25908][CORE][SQL] Remove old deprecated items in Spark 3 2018-11-07 22:48:50 -06:00
taskcontext.py [SPARK-32138] Drop Python 2.7, 3.4 and 3.5 2020-07-14 11:22:44 +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-32138] Drop Python 2.7, 3.4 and 3.5 2020-07-14 11:22:44 +09:00
version.py [SPARK-30950][BUILD] Setting version to 3.1.0-SNAPSHOT 2020-02-25 19:44:31 -08:00
worker.py [MINOR][PYTHON] Fix spacing in error message 2020-07-28 11:22:18 +09:00