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executor: add window function NTILE #9682

merged 7 commits into from Mar 15, 2019


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commented Mar 12, 2019

What problem does this PR solve?

Implement window function NTILE. It divides the rows into n groups, and returns the group number a row belongs to.

Part of #9499

What is changed and how it works?

Implement its execution logic

Check List


  • Unit test

Related changes

  • Need to update the documentation

@winoros winoros requested review from zz-jason, qw4990 and lamxTyler Mar 12, 2019

@lamxTyler lamxTyler referenced this pull request Mar 12, 2019


support all window functions #9499

11 of 11 tasks complete

winoros added some commits Mar 13, 2019

@lamxTyler lamxTyler added this to In progress in window function via automation Mar 13, 2019


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commented Mar 13, 2019

Codecov Report

Merging #9682 into master will decrease coverage by 0.0245%.
The diff coverage is 0%.

@@               Coverage Diff                @@
##             master      #9682        +/-   ##
- Coverage   67.2243%   67.1998%   -0.0246%     
  Files           380        381         +1     
  Lines         79788      79835        +47     
+ Hits          53637      53649        +12     
- Misses        21361      21404        +43     
+ Partials       4790       4782         -8

type partialResult4Ntile struct {
curIdx uint64
divisor uint64

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lamxTyler Mar 13, 2019


Is it needed? Can we just use the n in ntile?

winoros added some commits Mar 15, 2019

@winoros winoros requested a review from lamxTyler Mar 15, 2019

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window function automation moved this from In progress to Reviewer approved Mar 15, 2019

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@winoros winoros merged commit 3a48d9c into pingcap:master Mar 15, 2019

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window function automation moved this from Reviewer approved to Done Mar 15, 2019

@winoros winoros deleted the winoros:window-ntile branch Mar 15, 2019

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