sessionctx: record if a query hits plan cache in slow log (#17088) #17121
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cherry-pick #17088 to release-4.0
What problem does this PR solve?
Issue Number: close #16197
Problem Summary:
Not a problem, this is an enhancement for diagnose purpose.
What is changed and how it works?
What's Changed:
Add new
Plan_from_cachefield in slow log.Related changes
pingcap/docs/pingcap/docs-cn:Check List
Tests
Side effects
N/A
Release note