executor, stats: extract topn from cm sketch #11409
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
alivxxx
added
type/enhancement
Codecov Report
@@ Coverage Diff @@
## master #11409 +/- ##
===========================================
Coverage 81.5217% 81.5217%
===========================================
Files 424 424
Lines 91578 91578
===========================================
Hits 74656 74656
Misses 11578 11578
Partials 5344 5344 |
winoros
reviewed
Jul 25, 2019
eurekaka
reviewed
Jul 29, 2019
alivxxx
added
status/LGT2
|
/run-all-tests |
|
/run-unit-test |
|
/rebuild |
alivxxx
added a commit
to alivxxx/tidb
that referenced
this pull request
Nov 13, 2019
sre-bot
pushed a commit
that referenced
this pull request
Nov 13, 2019
sre-bot
pushed a commit
that referenced
this pull request
Nov 13, 2019
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
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
Side effects
Related changes