ddl, stats: handle add/trunctate partition events (#14500) #14566
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cherry-pick #14500 to release-3.0
What problem does this PR solve?
When add or truncate paritions, stats is not automatically updated.
What is changed and how it works?
Handle ddl events for add or truncate partitions in stats.
Check List
Tests
Code changes
Side effects
Related changes
Release note