Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/15987
Thank you for review, @rxin . In the expression, the partition attribute
are assumed `String`, so Analyzer injects that.
I tried to implement the following recommended way in JIRA issue, but the
PR may choose not a clean way. Do you mean `CommandWithExpression` in
`command.scala` and `Analyzer.scala`?
> The Analyzer is injecting casts because the dataType of the partition
attribute is a String:
>
https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala#L223
> This is not trivial to solve. If we want to properly fix this, we need to
use UnresolvedAttributes and do some add some analysis for this command.
Another - hackier - way of getting there would, to explicitly exclude this
command from analysis.
> I am personally a proponent of option 1.
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