Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/4057#issuecomment-70948141
@adrian-wang Seems we need to add rule in
`org.apache.spark.sql.catalyst.analysis.HiveTypeCoercion.FunctionArgumentConversion`
to cast the data types of expressions in Coalesce. Also, seems
`ExpressionEvaluationSuite` will be a good place to add more tests for
evaluating Coalesce.
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