statistics: Added note about no TopN collected for unique single columns#21633
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statistics: Added note about no TopN collected for unique single columns#21633qiancai wants to merge 3 commits into
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Auto-sync completed successfully Source PR: pingcap/docs#22475 Chinese documentation has been updated based on English documentation changes. |
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What is changed, added or deleted? (Required)
Added a note that TopN is not collected for single column unique indexes or its corresponding column.
See pingcap/tidb#66236
Which TiDB version(s) do your changes apply to? (Required)
Tips for choosing the affected version(s):
By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.
For details, see tips for choosing the affected versions.
What is the related PR or file link(s)?
executor: skip TopN collection for single-column unique indexes | tidb-test=pr/2687 tidb#66236
Do your changes match any of the following descriptions?