stmtsummary: fix issue of concurrent map read and write (#35367) #35386
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cherry-pick #35367 to release-6.0
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# In tidb repo: git pr https://github.com/pingcap/tidb/pull/35386
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Signed-off-by: crazycs520 crazycs520@gmail.com
What problem does this PR solve?
Issue Number: close #35340
Problem Summary: statements_summary has concurrent map read and write
What is changed and how it works?
Check List
Tests
Release note
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