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Enhance the virtual table query planner so that it is able to deal with

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ORDER BY terms that contain COLLATE clauses as long as the specified
collation matches the virtual table.  This is especially important for
UNION ALL since a "COLLATE binary" is added to ORDER BY clauses if no
COLLATE clause exists in the original SQL.

FossilOrigin-Name: 5c3d398d20b86a1558720e995eddf11403aec2d160590571fa9525fe8f6efff9
This commit is contained in:
drh
2021-12-14 20:13:28 +00:00
parent 22f018c938
commit 52576b78f6
4 changed files with 61 additions and 9 deletions
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17
test/tabfunc01.test
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@@ -145,6 +145,23 @@ do_eqp_test tabfunc01-3.13 {
}
do_eqp_test tabfunc01-3.20 {
WITH t1(a) AS (
SELECT value FROM generate_series(0,10,2)
UNION ALL
SELECT value FROM generate_series(9,18,3)
)
SELECT * FROM t1 ORDER BY a;
} {
QUERY PLAN
`--MERGE (UNION ALL)
|--LEFT
| `--SCAN generate_series VIRTUAL TABLE INDEX 23:
`--RIGHT
`--SCAN generate_series VIRTUAL TABLE INDEX 23:
}
# Eponymous virtual table exists in all schemas.
#
do_execsql_test tabfunc01-4.1 {