Github user hvanhovell commented on the pull request: https://github.com/apache/spark/pull/10488#issuecomment-167418258 There a quite a few builds passing which are using string concatenation in combination with ```ExpressionDescription```: https://github.com/apache/spark/pull/10489 https://github.com/apache/spark/pull/10418 https://github.com/apache/spark/pull/10402 Maybe something else is causing this?
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