Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/4940#issuecomment-81089066
See
https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/rows.scala#L67
Usually we don't the the validity of `ordinal` within the callee, the
caller should take care of that.
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