Github user holdenk commented on a diff in the pull request:
https://github.com/apache/spark/pull/16094#discussion_r90764328
--- Diff: python/pyspark/sql/column.py ---
@@ -298,19 +299,34 @@ def isin(self, *cols):
isNotNull = _unary_op("isNotNull", "True if the current expression is
not null.")
@since(1.3)
- def alias(self, *alias):
+ def alias(self, *alias, **kwargs):
"""
Returns this column aliased with a new name or names (in the case
of expressions that
return more than one column, such as explode).
+ Optional ``metadata`` keyword argument can be passed when aliasing
a single column.
--- End diff --
2.2 is probably right, although the current 2.1 RC is more a of a strawman
so it is possible (but up to @davies / @marmbrus if this warrants going into
2.1).
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