pingcap / pingcap/tidb

improve performance for the BuildHistAndTopN

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#49,180 0 comments 0 reactions 0 assignees View on GitHub
type/enhancement
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Go
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Description

## Enhancement

Now, Analyze will take most of the time on the ```BuildHistAndTopN```. ```BuildHistAndTopN``` have many unnecessary sort and compare with low NDV. so we can merge the same data then sort and compare. it will have better performance.

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