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executor: forbid read from stale query result (#25954) #26200
executor: forbid read from stale query result (#25954) #26200
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Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
/run-all-tests |
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Signed-off-by: xhe <xw897002528@gmail.com>
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LGTM
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/merge |
This pull request has been accepted and is ready to merge. Commit hash: d87f4a9
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cherry-pick #25954 to release-5.1
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# In tidb repo: git pr https://github.com/pingcap/tidb/pull/26200
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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 thehandleTableName
are ignored due toinCreateOrDropTable
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 theselect
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 theas ...
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
Release note