statistic: fix error when fast analyze on only indexes (#15889) #15967
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cherry-pick #15889 to release-3.0
What problem does this PR solve?
Issue Number: close #15752
Problem Summary: in the fast sample, we use the wrong column info to build index value. When we only analyze indexes, the analyzing column infos is nil. Then we should use table info's columns to build index value.
What is changed and how it works?
What's Changed: change
colInfostotblInfo.ColumnsRelated changes
Check List
Tests