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use SEMI_JOIN_REWRITE to control the exists/in's behavior #35323

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winoros opened this issue Jun 13, 2022 · 0 comments · Fixed by #35325
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use SEMI_JOIN_REWRITE to control the exists/in's behavior #35323

winoros opened this issue Jun 13, 2022 · 0 comments · Fixed by #35325
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affects-6.1 sig/planner SIG: Planner type/enhancement The issue or PR belongs to an enhancement.

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winoros commented Jun 13, 2022

Enhancement

Previously, we have the session variable tidb_opt_insubq_to_join_and_agg to control the in subquery's behavior. But the variable is not very suitable for SPM.

And that variable only controls the IN subquery. It doesn't handle the EXISTS because we need to decorrelated first then check whether we can rewrite the semi join.

This time, we introduce the hint to control its behavior.
@winoros winoros added type/enhancement The issue or PR belongs to an enhancement. sig/planner SIG: Planner labels Jun 13, 2022
@winoros winoros self-assigned this Jun 13, 2022
@winoros winoros mentioned this issue Jun 13, 2022
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ti-chi-bot pushed a commit that referenced this issue Jul 14, 2022
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planner: use SEMI_JOIN_REWRITE hint to rewrite the semi join (#35325)
b4cd14d 
close #35323
@ti-srebot ti-srebot mentioned this issue Aug 22, 2022
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ti-chi-bot pushed a commit that referenced this issue Aug 23, 2022
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planner: use SEMI_JOIN_REWRITE hint to rewrite the semi join (#35325) (…
bf0e7a1 
…#37283)

close #35323
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planner: use SEMI_JOIN_REWRITE hint to rewrite the semi join winoros/tidb
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