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tools4origins 25c5d57883 [MINOR][DOC] Fix python variance() documentation 
## What changes were proposed in this pull request?

The Python documentation incorrectly says that `variance()` acts as `var_pop` whereas it acts like `var_samp` here: https://spark.apache.org/docs/latest/api/python/pyspark.sql.html#pyspark.sql.functions.variance

It was not the case in Spark 1.6 doc but it is in Spark 2.0 doc:
https://spark.apache.org/docs/1.6.0/api/java/org/apache/spark/sql/functions.html
https://spark.apache.org/docs/2.0.0/api/java/org/apache/spark/sql/functions.html

The Scala documentation is correct: https://spark.apache.org/docs/latest/api/java/org/apache/spark/sql/functions.html#variance-org.apache.spark.sql.Column-

The alias is set on this line:
https://github.com/apache/spark/blob/v2.4.3/sql/core/src/main/scala/org/apache/spark/sql/functions.scala#L786

## How was this patch tested?
Using variance() in pyspark 2.4.3 returns:
```
>>> spark.createDataFrame([(1, ), (2, ), (3, )], "a: int").select(variance("a")).show()
+-----------+
|var_samp(a)|
+-----------+
|        1.0|
+-----------+
```

Closes #24895 from tools4origins/patch-1.

Authored-by: tools4origins <tools4origins@gmail.com>
Signed-off-by: Dongjoon Hyun <dhyun@apple.com>
2019-06-20 08:10:19 -07:00
..
avro [SPARK-26856][PYSPARK][FOLLOWUP] Fix UT failure due to wrong patterns for Kinesis assembly 2019-04-02 14:52:56 +09:00
tests [SPARK-28041][PYTHON] Increase minimum supported Pandas to 0.23.2 2019-06-18 09:10:58 +09:00
__init__.py [SPARK-22369][PYTHON][DOCS] Exposes catalog API documentation in PySpark 2017-11-02 15:22:52 +01:00
catalog.py [SPARK-24665][PYSPARK][FOLLOWUP] Use SQLConf in PySpark to manage all sql configs 2018-08-17 10:18:08 +08:00
column.py [SPARK-28031][PYSPARK][TEST] Improve doctest on over function of Column 2019-06-13 11:04:41 +09:00
conf.py [SPARK-23698][PYTHON] Resolve undefined names in Python 3 2018-08-22 10:06:59 -07:00
context.py [SPARK-26640][CORE][ML][SQL][STREAMING][PYSPARK] Code cleanup from lgtm.com analysis 2019-01-17 19:40:39 -06:00
dataframe.py [SPARK-27834][SQL][R][PYTHON] Make separate PySpark/SparkR vectorization configurations 2019-06-03 10:01:37 +09:00
functions.py [MINOR][DOC] Fix python variance() documentation 2019-06-20 08:10:19 -07:00
group.py [SPARK-24722][SQL] pivot() with Column type argument 2018-08-04 14:17:32 +08:00
readwriter.py [SPARK-28058][DOC] Add a note to doc of mode of CSV for column pruning 2019-06-18 13:48:32 +09:00
session.py [SPARK-27995][PYTHON] Note the difference between str of Python 2 and 3 at Arrow optimized 2019-06-11 18:43:59 +09:00
streaming.py [SPARK-27627][SQL] Make option "pathGlobFilter" as a general option for all file sources 2019-05-09 08:41:43 +09:00
types.py [SPARK-23299][SQL][PYSPARK] Fix __repr__ behaviour for Rows 2019-05-06 10:00:49 -07:00
udf.py [SPARK-26412][PYSPARK][SQL] Allow Pandas UDF to take an iterator of pd.Series or an iterator of tuple of pd.Series 2019-06-15 08:29:20 -07:00
utils.py [SPARK-28041][PYTHON] Increase minimum supported Pandas to 0.23.2 2019-06-18 09:10:58 +09:00
window.py [MINOR][PYSPARK][SQL][DOC] Fix rowsBetween doc in Window 2019-06-14 09:56:37 +09:00