[COMMITTERS] pgsql: Allow rel_is_distinct_for() to look through RelabelType belowOp

Allow rel_is_distinct_for() to look through RelabelType below OpExpr.

This lets it do the right thing for, eg, varchar columns.
Back-patch to 9.5 where this logic appeared.

David Rowley, per report from Kim Rose Carlsen

Discussion: https://postgr.es/m/VI1PR05MB17091F9A9876528055D6A827C76D0@VI1PR05MB1709.eurprd05.prod.outlook.com

Branch
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REL9_5_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/eeff6839633d97c03a43889ed7c83df81d513f08

Modified Files
--------------
src/backend/optimizer/plan/analyzejoins.c | 8 ++++++++
1 file changed, 8 insertions(+)


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