Alex Behm ae9fd52c51
IMPALA-2089: Retain eq predicates bound by grouping slots with complex grouping exprs. ...
The bug: When enforcing slot equivalences at an aggregation node, we used to
incorrectly assume that equivalences among grouping slots must have already been
enforced below the aggregation (e.g., in a scan). This assumption is correct if the
grouping slots are produced by simple SlotRef grouping exprs, because then there is
certainly a value transfer between the grouping slot and another slot below the
aggregation. However, for grouping slots with complex grouping exprs this assumption
is not correct, and as a result, we would incorrectly remove eq predicates bound by
gropuing slots with complex grouping exprs because we assumed they were redundant.
Ths fix is to enforce slot equivalences among grouping slots with complex grouping
exprs as usual, and not assume that they have already been enforced below the agg.
Change-Id: Idcd44acccb9326a35c9121025dc88c2c70c7c7c7
Reviewed-on: http://gerrit.cloudera.org:8080/656
Reviewed-by: Alex Behm <alex.behm@cloudera.com >
Tested-by: Internal Jenkins
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