src/backend/optimizer/util/pathnode.c · 864412fd0a1e8983d4241383f13a5492bc795765 · Abuhujair Javed / Postgres FD Implementation · GitLab

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Recognize that IN subqueries return already-unique results if they use · 864412fd
Tom Lane authored Jan 19, 2004
```
UNION/INTERSECT/EXCEPT (without ALL).  This adds on to the previous
optimization for subqueries using DISTINCT.
```
864412fd

pathnode.c 24.5 KB