planner: do not cache prepared plan if optimization depends on mutable constant (#22349) #22353
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Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
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Jan 14, 2021
planner/core/prepare_test.go
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| @@ -830,3 +830,68 @@ func (s *testPrepareSuite) TestPrepareForGroupByMultiItems(c *C) { | |||
| tk.MustExec(`prepare stmt2 from "select sum(b) from t group by ?, ?"`) | |||
| tk.MustQuery(`execute stmt2 using @v1, @v2`).Check(testkit.Rows("10")) | |||
| } | |||
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PTAL @Reminiscent |
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cherry-pick #22349 to release-4.0
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# In tidb repo: git pr 22353After apply modifications, you can push your change to this PR via:
What problem does this PR solve?
Issue Number: close #22167
Problem Summary:
Incorrectly reuse cached plan which turns outer join to inner join.
What is changed and how it works?
What's Changed & How it Works:
EvaluateExprWithNullis used in several optimizations such as converting outer join to inner join. If the result ofEvaluateExprWithNulldepends on parameters of execute statement, whether the optimizations can be used is affected by the parameters. When optimizing a prepared plan, ifexprpassed intoEvaluateExprWithNullcontains mutable constant, we still do optimization but do not cache the plan.Related changes
pingcap/docs/pingcap/docs-cn:Check List
Tests a
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