Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/4994#issuecomment-81108144
Because `updateProjection` is the projection between `child.output` and the
aggregations `updateExpressions`. Its `inputSchema` should be just
`child.output`. It is unnecessary to add `computeFunctions.flatMap(_.schema)`.
It would not break anything because it just adds useless input schema. The
aggregations `updateExpressions` will never use that. That is why removing it
passes all tests.
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