Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/18106#discussion_r123824736
--- Diff: python/pyspark/sql/functions.py ---
@@ -1028,20 +1028,28 @@ def to_timestamp(col, format=None):
@since(1.5)
-def trunc(date, format):
+def trunc(data, format):
"""
- Returns date truncated to the unit specified by the format.
+ Returns date truncated to the unit specified by the format or
+ number truncated by specified decimal places.
:param format: 'year', 'YYYY', 'yy' or 'month', 'mon', 'mm'
>>> df = spark.createDataFrame([('1997-02-28',)], ['d'])
- >>> df.select(trunc(df.d, 'year').alias('year')).collect()
+ >>> df.select(trunc(to_date(df.d), 'year').alias('year')).collect()
[Row(year=datetime.date(1997, 1, 1))]
- >>> df.select(trunc(df.d, 'mon').alias('month')).collect()
+ >>> df.select(trunc(to_date(df.d), 'mon').alias('month')).collect()
--- End diff --
Here too. If this change is needed to pass Pyhon tests, it looks breaking
the compatibility.
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