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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