executor, stats: extract topn from cm sketch #11409
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Codecov Report
@@ Coverage Diff @@
## master #11409 +/- ##
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Coverage 81.5217% 81.5217%
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Files 424 424
Lines 91578 91578
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Hits 74656 74656
Misses 11578 11578
Partials 5344 5344 |
winoros
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eurekaka
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Jul 29, 2019
alivxxx
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/run-all-tests |
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/run-unit-test |
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/rebuild |
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What problem does this PR solve?
Extract topn from cm sketch for normal analyze to avoid hash collision of frequent values.
What is changed and how it works?
For columns stats, we can build the topn from samples; for index stats, extract the topn from histogram boundaries.
Check List
Tests
Code changes
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