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[SPARK-30430][PYTHON][DOCS] Add a note that UserDefinedFunction's constructor is private

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### What changes were proposed in this pull request?

This PR adds a note that UserDefinedFunction's constructor is private.

### Why are the changes needed?

To match with Scala side. Scala side does not have it at all.

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

Doc only changes but it declares UserDefinedFunction's constructor is private explicitly.

### How was this patch tested?

Jenkins

Closes #27101 from HyukjinKwon/SPARK-30430.

Authored-by: HyukjinKwon <gurwls223@apache.org>
Signed-off-by: HyukjinKwon <gurwls223@apache.org>
This commit is contained in:
HyukjinKwon 2020-01-07 10:13:40 +09:00
parent 88542bc3d9
commit 3ba175ef9a
1 changed files with 4 additions and 0 deletions
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4
python/pyspark/sql/udf.py
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@ -84,6 +84,10 @@ class UserDefinedFunction(object):
User defined function in Python
.. versionadded:: 1.3
.. note:: The constructor of this class is not supposed to be directly called.
Use :meth:`pyspark.sql.functions.udf` or :meth:`pyspark.sql.functions.pandas_udf`
to create this instance.
"""
def __init__(self, func,
returnType=StringType(),