[Fix](nereids) fix NormalizeAgg, change the upper project projections rewrite logic #36623
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… rewrite logic (apache#36161) NormalizeAggregate rewrite logic has a bug, for sql like this: SELECT CASE 1 WHEN CAST( NULL AS SIGNED ) THEN NULL WHEN COUNT( DISTINCT CAST( NULL AS SIGNED ) ) THEN NULL ELSE null END ; This is the plan after NormalizeAggregate, the LogicalAggregate only output `count(DISTINCT cast(NULL as SIGNED))`apache#3, do not output cast(NULL as SIGNED)apache#2, but the upper project use cast(NULL as SIGNED)apache#2, so Doris report error "cast(NULL as SIGNED) not in aggregate's output". LogicalResultSink[29] ( outputExprs=[__case_when_0#1] ) +--LogicalProject[26] ( distinct=false, projects=[CASE WHEN (1 = cast(NULL as SIGNED)apache#2) THEN NULL WHEN (1 = count(DISTINCT cast(NULL as SIGNED))apache#3) THEN NULL ELSE NULL END AS `CASE WHEN (1 = cast(NULL as SIGNED)) THEN NULL WHEN (1 = count(DISTINCT cast(NULL as SIGNED))) THEN NULL ELSE NULL END`apache#1], excepts=[] ) +--LogicalAggregate[25] ( groupByExpr=[], outputExpr=[count(DISTINCT cast(NULL as SIGNED)apache#2) AS `count(DISTINCT cast(NULL as SIGNED))`apache#3], hasRepeat=false ) +--LogicalProject[24] ( distinct=false, projects=[cast(NULL as SIGNED) AS `cast(NULL as SIGNED)`apache#2], excepts=[] ) +--LogicalOneRowRelation ( projects=[0 AS `0`#0] ) The problem is that the cast(NULL as SIGNED)apache#2 should not outputted by LogicalAggregate, cast(NULL as SIGNED) should be computed in LogicalProject. This pr change the upper project projections rewrite logic: aggregateOutputs is rewritten and become the upper-level LogicalProject projections. During the rewriting process, the expressions inside the agg function can be rewritten with expressions in aggregate function arguments and group by expressions, but the ones outside the agg function can only be rewritten with group by expressions.
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Thank you for your contribution to Apache Doris. Since 2024-03-18, the Document has been moved to doris-website. |
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run buildall |
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run buildall |
TPC-H: Total hot run time: 49790 ms |
TPC-DS: Total hot run time: 204909 ms |
ClickBench: Total hot run time: 31.38 s |
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Load test result on machine: 'aliyun_ecs.c7a.8xlarge_32C64G' |
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Aug 16, 2024
… rewrite logic (apache#36623) cherry-pick apache#36161 to branch-2.0 NormalizeAggregate rewrite logic has a bug, for sql like this: SELECT CASE 1 WHEN CAST( NULL AS SIGNED ) THEN NULL WHEN COUNT( DISTINCT CAST( NULL AS SIGNED ) ) THEN NULL ELSE null END ; This is the plan after NormalizeAggregate, the LogicalAggregate only output `count(DISTINCT cast(NULL as SIGNED))`apache#3, do not output cast(NULL as SIGNED)apache#2, but the upper project use cast(NULL as SIGNED)apache#2, so Doris report error "cast(NULL as SIGNED) not in aggregate's output". LogicalResultSink[29] ( outputExprs=[__case_when_0#1] ) +--LogicalProject[26] ( distinct=false, projects=[CASE WHEN (1 = cast(NULL as SIGNED)apache#2) THEN NULL WHEN (1 = count(DISTINCT cast(NULL as SIGNED))apache#3) THEN NULL ELSE NULL END AS `CASE WHEN (1 = cast(NULL as SIGNED)) THEN NULL WHEN (1 = count(DISTINCT cast(NULL as SIGNED))) THEN NULL ELSE NULL END`apache#1], excepts=[] ) +--LogicalAggregate[25] ( groupByExpr=[], outputExpr=[count(DISTINCT cast(NULL as SIGNED)apache#2) AS `count(DISTINCT cast(NULL as SIGNED))`apache#3], hasRepeat=false ) +--LogicalProject[24] ( distinct=false, projects=[cast(NULL as SIGNED) AS `cast(NULL as SIGNED)`apache#2], excepts=[] ) +--LogicalOneRowRelation ( projects=[0 AS `0`#0] ) The problem is that the cast(NULL as SIGNED)apache#2 should not outputted by LogicalAggregate, cast(NULL as SIGNED) should be computed in LogicalProject. This pr change the upper project projections rewrite logic: aggregateOutputs is rewritten and become the upper-level LogicalProject projections. During the rewriting process, the expressions inside the agg function can be rewritten with expressions in aggregate function arguments and group by expressions, but the ones outside the agg function can only be rewritten with group by expressions. --------- Co-authored-by: moailing <moailing@selectdb.com>
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cherry-pick #36161 to branch-2.0
NormalizeAggregate rewrite logic has a bug, for sql like this:
This is the plan after NormalizeAggregate, the LogicalAggregate only output
count(DISTINCT cast(NULL as SIGNED))#3, do not output cast(NULL as SIGNED)#2, but the upper project use cast(NULL as SIGNED)#2, so Doris report error "cast(NULL as SIGNED) not in aggregate's output".The problem is that the cast(NULL as SIGNED)#2 should not outputted by LogicalAggregate, cast(NULL as SIGNED) should be computed in LogicalProject.
This pr change the upper project projections rewrite logic: aggregateOutputs is rewritten and become the upper-level LogicalProject projections. During the rewriting process, the expressions inside the agg function can be rewritten with expressions in aggregate function arguments and group by expressions, but the ones outside the agg function can only be rewritten with group by expressions.
Proposed changes
Issue Number: close #xxx