session, executor: support setting tidb_enable_stmt_summary in session scope #12308 #12499
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…n scope (pingcap#12217) (pingcap#12308) cherry-pick 12308 to release-3.1
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cherry-pick #12308 to release-3.1, with little conflict-resolve
What problem does this PR solve?
Support setting tidb_enable_stmt_summary in session scope. It was only supported in global scope. Actually, session scope here equals server scope, and global scope here equals cluster scope.
What is changed and how it works?
When statement summary is enabled in global scope, it'll work immediately on the current server and work in 2 seconds on the other servers in the cluster.
When statement summary is enabled in session scope, it'll work immediately on the current server, and subsequent settings in the global scope won't work.
If tidb_enable_stmt_summary is set to '' in session scope, then tidb_enable_stmt_summary in global scope works in the current server.
Check List
Tests
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Release Note