pingcap / pingcap/tidb

Rewrite in subquery to exists

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#33,192 1 comment 0 reactions 0 assignees View on GitHub
type/enhancement
Dominant language
Go
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Description

## Enhancement

Currently optimizer doesn't rewrite `a in (select b from ...)` to `exists (select b from ... where b = a)`. The rewriting may make optimizer find better plan.

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