planner: check clustered index don't need double read#18054
Merged
lzmhhh123 merged 9 commits intopingcap:masterfrom Jun 17, 2020
Merged
planner: check clustered index don't need double read#18054lzmhhh123 merged 9 commits intopingcap:masterfrom
lzmhhh123 merged 9 commits intopingcap:masterfrom
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coocood
reviewed
Jun 16, 2020
planner/core/logical_plan_builder.go
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| // Init commonHandleCols and commonHandleLens for data source. | ||
| if tableInfo.IsCommonHandle { | ||
| for _, idx := range tableInfo.Indices { | ||
| if idx.Primary { |
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There is a function tables.FindPrimaryIndex can be used.
coocood
reviewed
Jun 16, 2020
planner/core/find_best_task.go
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| isIndexColumn := false | ||
| for i, indexCol := range indexColumns { | ||
| isFullLen := idxColLens[i] == types.UnspecifiedLength || idxColLens[i] == col.RetType.Flen | ||
| for i, indexCol := range indexCols { |
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We can extract this for loop, and call it twice with indexColumns and commonHandleCols.
So we don't need to append slices.
coocood
reviewed
Jun 16, 2020
planner/core/find_best_task.go
Outdated
| } else { | ||
| if len(is.IdxCols) < len(is.Columns) { | ||
| for i := len(is.IdxCols); i < len(idxExprCols); i++ { | ||
| indexCols = append(indexCols, idxExprCols[i]) |
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Need to check if idxExprCols[i] != nil?
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idxExprCols here for common handle never be nil.
Codecov Report
@@ Coverage Diff @@
## master #18054 +/- ##
================================================
- Coverage 79.7721% 79.4275% -0.3447%
================================================
Files 526 524 -2
Lines 145913 142200 -3713
================================================
- Hits 116398 112946 -3452
+ Misses 20187 20104 -83
+ Partials 9328 9150 -178 |
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|
/run-unit-test |
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/run-unit-test |
1 similar comment
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/run-unit-test |
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/run-check_dev |
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/run-all-tests |
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@lzmhhh123 merge failed. |
12 tasks
This was referenced Feb 12, 2023
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What problem does this PR solve?
Problem Summary: as the title says.
What is changed and how it works?
What's Changed: check clustered index don't need double read
Check List
Tests
Side effects
Release note