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MDEV-34888 Implement SEMIJOIN() and SUBQUERY() hints

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This commit is contained in:
Oleg Smirnov
2024-09-11 19:53:57 +07:00
parent e3bf4c826c
commit 2c8f6058c1
28 changed files with 3712 additions and 164 deletions
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4
sql/opt_subselect.h
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@@ -117,6 +117,7 @@ public:
bound
5. But some of the IN-equalities aren't (so this can't be handled by
FirstMatch strategy)
6. LooseScan strategy is enabled for this SJ nest
*/
best_loose_scan_cost= DBL_MAX;
if (!join->emb_sjm_nest && s->emb_sj_nest && // (1)
@@ -127,7 +128,8 @@ public:
!(remaining_tables &
s->emb_sj_nest->nested_join->sj_corr_tables) && // (4)
remaining_tables & s->emb_sj_nest->nested_join->sj_depends_on &&// (5)
optimizer_flag(join->thd, OPTIMIZER_SWITCH_LOOSE_SCAN))
(s->emb_sj_nest->nested_join->sj_enabled_strategies & // (6)
OPTIMIZER_SWITCH_LOOSE_SCAN))
{
/* This table is an LooseScan scan candidate */
bound_sj_equalities= get_bound_sj_equalities(s->emb_sj_nest,