Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/17901#discussion_r115398027
--- Diff: python/pyspark/sql/functions.py ---
@@ -987,9 +981,10 @@ def months_between(date1, date2):
def to_date(col, format=None):
"""Converts a :class:`Column` of :class:`pyspark.sql.types.StringType`
or
:class:`pyspark.sql.types.TimestampType` into
:class:`pyspark.sql.types.DateType`
- using the optionally specified format. Default format is 'yyyy-MM-dd'.
- Specify formats according to
+ using the optionally specified format. Specify formats according to
`SimpleDateFormats
<http://docs.oracle.com/javase/tutorial/i18n/format/simpleDateFormat.html>`_.
+ By default, it follows casting rules to
:class:`pyspark.sql.types.DateType` if the format
--- End diff --
ditto, not sure if it's clear to python user with `casting rules to
:class:pyspark.sql.types.DateType`
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