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planner,executor: fix select big number on hash partition table panic (#17881) #18186

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merged 5 commits into from
Aug 3, 2020

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cherry-pick #17881 to release-4.0


What problem does this PR solve?

Issue Number: close #17813

Problem Summary:

What is changed and how it works?

What's Changed:

Use abs(val % pi.Num) rather than abs(val) % pi.Num

How it Works:

abs(9223372036854775808) get a negative number that is not expected.

We must make sure the return pos is a positive number:

pos = abs(val) % pi.Num
p[pos]

Related changes

  • Need to cherry-pick to the release branch

Check List

Tests

  • Unit test

Release note

  • Fix a panic on hash partition table when the query condition is that the partition column equals to a big number like 9223372036854775808

Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
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/run-all-tests

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@tiancaiamao please accept the invitation then you can push to the cherry-pick pull requests.
https://github.com/ti-srebot/tidb/invitations

@imtbkcat
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@tiancaiamao please fix conflict

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/run-all-tests

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PTAL @imtbkcat @wjhuang2016

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@wjhuang2016 wjhuang2016 left a comment

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LGTM

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@wjhuang2016, Thanks for your review, however we are sorry that your vote won't be count. You are not a reviewer or committer or co-leader or leader for the related sigs:execution(slack).

@zz-jason zz-jason modified the milestones: v4.0.2, v4.0.3 Jul 10, 2020
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PTAL @imtbkcat

@winoros winoros modified the milestones: v4.0.3, v4.0.4 Jul 15, 2020
@imtbkcat imtbkcat modified the milestones: v4.0.4, v4.0.5 Jul 28, 2020
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LGTM

@ti-srebot ti-srebot added the status/LGT1 Indicates that a PR has LGTM 1. label Aug 3, 2020
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imtbkcat commented Aug 3, 2020

/merge

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Sorry @imtbkcat, you don't have permission to trigger auto merge event on this branch.

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imtbkcat commented Aug 3, 2020

/run-all-tests

@jackysp jackysp merged commit e3b553d into pingcap:release-4.0 Aug 3, 2020
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7 participants