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statistics: support dump/load/gc extended statistics - #19260
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What problem does this PR solve?
Third TiDB PR for #18330
Parser PR: pingcap/parser#913, merged.
CREATE / DROP / RELOAD extended stats PR: #18880, merged.
Compute extended stats in ANALYZE: #19134, merged.
Problem Summary:
Not a problem, this is a new feature to support extended statistics for column groups.
What is changed and how it works?
What's Changed:
Support dump / load / gc for extended stats.
Related changes
Check List
Tests
Side effects
Release note