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executor: forbid read from stale query result (#25954) #26200

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merged 5 commits into from
Jul 22, 2021

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@ti-srebot ti-srebot commented Jul 13, 2021

cherry-pick #25954 to release-5.1
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/26200

After apply modifications, you can push your change to this PR via:

git push git@github.com:ti-srebot/tidb.git pr/26200:release-5.1-e04181b35193

Signed-off-by: xhe xw897002528@gmail.com

What problem does this PR solve?

Refer #25876

Problem Summary: Because the design of planner, select SQL in the view is not preprocess/checked while creating. I mean all the handleTableName are ignored due to inCreateOrDropTable mask.

Stale reads, however, relies on handleTableName to get the needed information. And I did not come up with a solution to only preprocess/check-staleness for the table name in the select part but view name.

The result is that, I can not tell if it is a stale query while executing DDL create view, nor can we tell while executing/optimizing. Not from the preprocess result of the whole SQL. It can be extracted from the as ... part, though.

The check is added in the creation process(DDL) to reduce performance impact. It is added in executor, however, due to cyclic imports between planner and ddl.

Check List

Tests

  • Unit test
  • Integration test

Release note

  • Forbid creating view from stale query

Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
@ti-srebot ti-srebot requested a review from a team as a code owner July 13, 2021 08:50
@ti-srebot ti-srebot requested review from qw4990 and removed request for a team July 13, 2021 08:50
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/run-all-tests

@ti-srebot ti-srebot added sig/execution SIG execution size/S Denotes a PR that changes 10-29 lines, ignoring generated files. type/5.1-cherry-pick labels Jul 13, 2021
@ti-srebot ti-srebot requested review from nolouch and Yisaer July 13, 2021 08:50
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@xhebox you're already a collaborator in bot's repo.

@nolouch nolouch removed the sig/execution SIG execution label Jul 13, 2021
@github-actions github-actions bot added the sig/execution SIG execution label Jul 13, 2021
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@nolouch: Thanks for your review. The bot only counts approvals from reviewers and higher roles in list, but you're still welcome to leave your comments.

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Signed-off-by: xhe <xw897002528@gmail.com>
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LGTM

@ti-chi-bot ti-chi-bot added the status/LGT1 Indicates that a PR has LGTM 1. label Jul 20, 2021
@nolouch nolouch removed the sig/execution SIG execution label Jul 22, 2021
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[REVIEW NOTIFICATION]

This pull request has been approved by:

  • AilinKid
  • nolouch

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

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@ti-chi-bot ti-chi-bot added status/LGT2 Indicates that a PR has LGTM 2. and removed status/LGT1 Indicates that a PR has LGTM 1. labels Jul 22, 2021
@github-actions github-actions bot added the sig/execution SIG execution label Jul 22, 2021
@zhouqiang-cl zhouqiang-cl added the cherry-pick-approved Cherry pick PR approved by release team. label Jul 22, 2021
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/merge

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This pull request has been accepted and is ready to merge.

Commit hash: d87f4a9

@ti-chi-bot ti-chi-bot added the status/can-merge Indicates a PR has been approved by a committer. label Jul 22, 2021
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@ti-srebot: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/run-all-tests

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

@ti-chi-bot ti-chi-bot merged commit b6398e8 into pingcap:release-5.1 Jul 22, 2021
@zhouqiang-cl zhouqiang-cl added this to the v5.1.1 milestone Jul 26, 2021
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