hanyuzheng7 commented on code in PR #22842:
URL: https://github.com/apache/flink/pull/22842#discussion_r1252343611
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flink-python/pyflink/table/expression.py:
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@@ -1558,6 +1558,18 @@ def map_keys(self) -> 'Expression':
"""
return _unary_op("mapKeys")(self)
+ @property
+ def map_union(self, map2) -> 'Expression':
+ """
+ Returns a map created by merging two maps, 'map1' and 'map2'.
+ These two maps should have same data structure. If there are
overlapping keys,
Review Comment:
`Returns a map created by merging two maps, 'map1' and 'map2'. These two
maps should have same type for their key and value individually. If there are
overlapping keys, the value from 'map2' will overwrite the value from 'map1'.
If any of maps is null, return null.`
What I want to say is that two maps' key and value should have same data
type.
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