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https://issues.apache.org/jira/browse/HIVE-21781?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gopal V updated HIVE-21781:
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Summary: Optimizer: Constant folding without CBO skips the aggregates
(was: Vectorization: Incomplete vectorization of "or false" with CBO off)
> Optimizer: Constant folding without CBO skips the aggregates
> ------------------------------------------------------------
>
> Key: HIVE-21781
> URL: https://issues.apache.org/jira/browse/HIVE-21781
> Project: Hive
> Issue Type: Bug
> Components: Logical Optimizer
> Reporter: Gopal V
> Priority: Major
>
> {code}
> create temporary table foo (x int) ;
> insert into foo values(1),(2),(3),(4),(5);
> set hive.explain.user=false;
> explain vectorization detail select count(case when (x=1 or false) then 1
> else 0 end ) from foo
> {code}
> {code}
> | Group By Operator |
> | aggregations: count(CASE WHEN (((x = 1) or false))
> THEN (1) ELSE (0) END) |
> | Group By Vectorization: |
> | aggregators:
> VectorUDAFCount(IfExprLongScalarLongScalar(col 3:boolean, val 1, val
> 0)(children: VectorUDFAdaptor(((x = 1) or false))(children:
> LongColEqualLongScalar(col 0:int, val 1) -> 2:boolean) -> 3:boolean) ->
> 4:int) -> bigint |
> | className: VectorGroupByOperator |
> {code}
> The pass-through Calcite fixes this.
> {code}
> | OPTIMIZED SQL: SELECT COUNT(CASE WHEN `x` = 1 THEN 1 ELSE 0 END) AS `$f0` |
> | FROM `default`.`foo`
> {code}
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