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Posted to issues@calcite.apache.org by "Vitalii Diravka (JIRA)" <ji...@apache.org> on 2018/04/15 17:55:00 UTC
[jira] [Updated] (CALCITE-2257) Combination of predicates can be
proved to be always true
[ https://issues.apache.org/jira/browse/CALCITE-2257?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Vitalii Diravka updated CALCITE-2257:
-------------------------------------
Labels: filter (was: )
> Combination of predicates can be proved to be always true
> ---------------------------------------------------------
>
> Key: CALCITE-2257
> URL: https://issues.apache.org/jira/browse/CALCITE-2257
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.16.0
> Reporter: Vitalii Diravka
> Assignee: Vitalii Diravka
> Priority: Major
> Labels: filter
> Fix For: 1.17.0
>
>
> I have found the case, when Filter operator is not necessary since filter condition is always true, but that is not detected by current version of Calcite.
> {code}
> select SAL from EMPNULLABLES_20 where SAL IS NOT NULL OR SAL is null
> {code}
> {code}
> LogicalProject(SAL=[$5])
> LogicalFilter(condition=[OR(IS NOT NULL($5), IS NULL($5))])
> LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4], SAL=[$5], COMM=[$6], SLACKER=[$8])
> LogicalFilter(condition=[AND(=($7, 20), >($5, 1000))])
> LogicalTableScan(table=[[CATALOG, SALES, EMPNULLABLES]])
> {code}
> But filter condition _OR(IS NOT NULL($5), IS NULL($5))_ can be proved to be always true.
> I have tried _ReduceExpressionsRule_, but it doesn't give effect.
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