Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/4057#issuecomment-70977695
Although coalesce only returns the first non-null value, but we need to
correctly set the type of coalesce. Let's say we have two columns. The type of
one is LongType and the type of another one is IntType, when we do coalesce,
the return type of coalesce should be LongType. Right now, there will be an
error when we are trying to call coalesce for these two columns. In
FunctionArgumentConversion, we should make sure all expressions of coalesce are
in the same type and if they are not, we should add cast.
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