Fix planning of star-schema-style queries.
Tom Lane <tgl@sss.pgh.pa.us>
Fix planning of star-schema-style queries. Part of the intent of the parameterized-path mechanism was to handle star-schema queries efficiently, but some overly-restrictive search limiting logic added in commit e2fa76d80ba571d4de8992de6386536867250474 prevented such cases from working as desired. Fix that and add a regression test about it. Per gripe from Marc Cousin. This is arguably a bug rather than a new feature, so back-patch to 9.2 where parameterized paths were introduced.
Files
| Path | Change | +/− |
|---|---|---|
| src/backend/optimizer/path/joinpath.c | modified | +31 −10 |
| src/backend/optimizer/README | modified | +27 −7 |
| src/test/regress/expected/join.out | modified | +19 −0 |
| src/test/regress/sql/join.sql | modified | +9 −0 |