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Relax query flattener constraint (3b) and thereby allow flattening the RHS of

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a LEFT JOIN even if the RHS contains a virtual table.  This was previously
disallowed by [9dbae1df75219e2a] as a performance optimization.  It
turns out that the constraint causes performance issues, and we do not have
a record of any performance issue that it solves.

FossilOrigin-Name: 1ddaa92057e550ea281d45d9860eafe69399224725548a93dd91c47a34e52152
This commit is contained in:
drh
2025-05-31 16:17:14 +00:00
parent 1ff4233f90
commit 5248693924
4 changed files with 14 additions and 17 deletions
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5
test/fts3join.test
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@ -97,11 +97,8 @@ do_eqp_test 4.2 {
WHERE t4.y = ?;
} {
QUERY PLAN
|--MATERIALIZE rr
| `--SCAN ft4 VIRTUAL TABLE INDEX 3:
|--SCAN t4
|--BLOOM FILTER ON rr (docid=?)
`--SEARCH rr USING AUTOMATIC COVERING INDEX (docid=?) LEFT-JOIN
`--SCAN ft4 VIRTUAL TABLE INDEX 3: LEFT-JOIN
}
finish_test