Recognize GROUPING() as a aggregate expression.

Andres Freund <andres@anarazel.de>

Commit: e6d8cb77c029b8122607e3d2eb1f3fca36d7b1db
Author: Andres Freund <andres@anarazel.de>
Date: 2015-07-26T14:50:02Z
Releases: 9.6.0
Recognize GROUPING() as a aggregate expression.

Previously GROUPING() was not recognized as a aggregate expression,
erroneously allowing the planner to move it from HAVING to WHERE.

Author: Jeevan Chalke
Reviewed-By: Andrew Gierth
Discussion: CAM2+6=WG9omG5rFOMAYBweJxmpTaapvVp5pCeMrE6BfpCwr4Og@mail.gmail.com
Backpatch: 9.5, where grouping sets were introduced

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