planner: projection don't new unnecessary column #13406
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alivxxx
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Nov 13, 2019
lzmhhh123
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Nov 13, 2019
ghost
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XuHuaiyu
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Codecov Report
@@ Coverage Diff @@
## master #13406 +/- ##
===========================================
Coverage 80.3292% 80.3292%
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Files 472 472
Lines 117311 117311
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Hits 94235 94235
Misses 15837 15837
Partials 7239 7239 |
francis0407
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Nov 13, 2019
|
/run-unit-test |
lzmhhh123
reviewed
Nov 14, 2019
| @@ -84,10 +73,7 @@ func exprHasSetVarOrSleep(expr expression.Expression) bool { | |||
| // If any expression has SetVar function or Sleep function, we do not prune it. | |||
| func (p *LogicalProjection) PruneColumns(parentUsedCols []*expression.Column) error { | |||
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It seems PruneColumns don't need to return error.
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There's a error check in Aggregation's PruneColumns. In line 113.
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@winoros merge failed. |
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/run-all-tests |
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/run-all-tests tidb-test=pr/950 |
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/run-common-test tidb-test=pr/950 |
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/run-common-test tidb-test=pr/950 |
1 similar comment
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/run-common-test tidb-test=pr/950 |
francis0407
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Nov 20, 2019
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/run-all-tests tidb-test=pr/950 |
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What problem does this PR solve?
Since name is splitted from the Column.
The project don't need to new column when the expr is just a column.
This makes it possible to merge the two project eliminating process which TiDB current has.
What is changed and how it works?
If the expression is column. We use it directly, instead of new one.
Check List
Tests