[improvement](external statistics)Fix external stats collection bugs (#22788) #23122
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…pache#22788) 1. Collect external table row count when execute analyze database. 2. Support show cached table stats (row count) 3. Support alter external table column stats. 4. Refresh/Invalidate table row count stat memory cache when analyze task finished and drop table stats.
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Aug 21, 2023
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This pr has four changes:
This is a cherry pick for pr:
#22788
Proposed changes
Issue Number: close #xxx
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