stats: specially handle unqiue key when estimate #13354
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@@ Coverage Diff @@
## master #13354 +/- ##
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- Coverage 81.8792% 80.5111% -1.3681%
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Files 469 469
Lines 200273 114517 -85756
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- Hits 163982 92199 -71783
+ Misses 24739 15340 -9399
+ Partials 11552 6978 -4574 |
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What problem does this PR solve?
When there are equal conditions on unique key, the estimation result should not greater than 1.
What is changed and how it works?
Take the unique info into consideration when we estimate equal conditions for indices and primary key.
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