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https://issues.apache.org/jira/browse/SPARK-25666?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-25666.
----------------------------------
Resolution: Fixed
Fix Version/s: 3.0.0
Issue resolved by pull request 22655
[https://github.com/apache/spark/pull/22655]
> Internally document type conversion between Python data and SQL types in UDFs
> -----------------------------------------------------------------------------
>
> Key: SPARK-25666
> URL: https://issues.apache.org/jira/browse/SPARK-25666
> Project: Spark
> Issue Type: Documentation
> Components: PySpark
> Affects Versions: 2.4.0
> Reporter: Hyukjin Kwon
> Assignee: Hyukjin Kwon
> Priority: Minor
> Fix For: 3.0.0
>
>
> Currently, UDF's type coercion is not cleanly defined. See also
> https://github.com/apache/spark/pull/22610 and
> https://github.com/apache/spark/pull/22610
> This JIRA targets to describe the type conversion logic internally. For
> instance:
> {code}
>
> +---------------+----+----+----+----+----+------------------------------+------------------------------+----+---------------+---------+----------------------------+------------+----+------------+---------+---------+
> # noqa
> | Type \ Value|None|True| 1| a| a| 1970-01-01|
> 1970-01-01 00:00:00| 1.0|array('i', [1])| [1]|
> (1,)| ABC| 1| {'a': 1}| Row(a=1)| Row(a=1)| # noqa
>
> +---------------+----+----+----+----+----+------------------------------+------------------------------+----+---------------+---------+----------------------------+------------+----+------------+---------+---------+
> # noqa
> | null|None|None|None|None|None| None|
> None|None| None| None|
> None| None|None| None| X| X| # noqa
> | boolean|None|True|None|None|None| None|
> None|None| None| None|
> None| None|None| None| X| X| # noqa
> | tinyint|None|None| 1|None|None| None|
> None|None| None| None|
> None| None|None| None| X| X| # noqa
> | smallint|None|None| 1|None|None| None|
> None|None| None| None|
> None| None|None| None| X| X| # noqa
> | int|None|None| 1|None|None| None|
> None|None| None| None|
> None| None|None| None| X| X| # noqa
> | bigint|None|None| 1|None|None| None|
> None|None| None| None|
> None| None|None| None| X| X| # noqa
> | string|None|true| 1| a|
> a|java.util.GregorianCalendar...|java.util.GregorianCalendar...| 1.0|
> [I@2d03fe27| [1]|[Ljava.lang.Object;@5ae74a34| [B@6e96d01e| 1|
> {a=1}| X| X| # noqa
> | date|None| X| X| X| X| 1970-01-01|
> 1970-01-01| X| X| X|
> X| X| X| X| X| X| # noqa
> | timestamp|None| X| X| X| X| X|
> 1970-01-01 00:00:00| X| X| X|
> X| X| X| X| X| X| # noqa
> | float|None|None|None|None|None| None|
> None| 1.0| None| None|
> None| None|None| None| X| X| # noqa
> | double|None|None|None|None|None| None|
> None| 1.0| None| None|
> None| None|None| None| X| X| # noqa
> | array<int>|None|None|None|None|None| None|
> None|None| [1]| [1]|
> [1]|[65, 66, 67]|None| None| X| X| # noqa
> | binary|None|None|None| a| a| None|
> None|None| None| None|
> None| ABC|None| None| X| X| # noqa
> | decimal(10,0)|None|None|None|None|None| None|
> None|None| None| None|
> None| None| 1| None| X| X| # noqa
> |map<string,int>|None|None|None|None|None| None|
> None|None| None| None|
> None| None|None| {u'a': 1}| X| X| # noqa
> | struct<_1:int>|None| X| X| X| X| X|
> X| X| X|Row(_1=1)|
> Row(_1=1)| X| X|Row(_1=None)|Row(_1=1)|Row(_1=1)| # noqa
>
> +---------------+----+----+----+----+----+------------------------------+------------------------------+----+---------------+---------+----------------------------+------------+----+------------+---------+---------+
> # noqa
> {code}
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