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https://issues.apache.org/jira/browse/CALCITE-5639?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Leonid Chistov updated CALCITE-5639:
------------------------------------
Description:
Consider query like
{code:java}
select r_reason_desc from reason
where r_reason_desc is not null and r_reason_desc like '%child%'
{code}
where "r_reason_desc" is a nullable field.
When RexSimplify::simplifyFilterPredicates is called on that conjunction of
expressions, expression is not simplified, meaning that redundant "is not
null" check is not removed.
In the same time, if query like
{code:java}
select r_reason_desc from reason
where r_reason_desc is not null and r_reason_desc >= 'A'{code}
is passed to optimizer, redundant "is not null" check is eliminated.
was:
Consider query likeselect r_reason_desc from reason where r_reason_desc is not
null and r_reason_desc like '%child%' desc is not null and r_reason_desc like
'%child%'
where `r_reason_desc` is a nullable field.
When `RexSimplify::simplifyFilterPredicates` is called on that conjunction of
expressions, expression is not simplified, meaning that redundant `is not
null` check is not removed.
In the same time, if query like
{code:java}
select r_reason_desc from reason
where r_reason_desc is not null and r_reason_desc like '%child%' {code}
is passed to optimizer, redundant `is not null` check is eliminated.
> RexSimplify not removes IS NOT NULL check when LIKE comparison is present
> -------------------------------------------------------------------------
>
> Key: CALCITE-5639
> URL: https://issues.apache.org/jira/browse/CALCITE-5639
> Project: Calcite
> Issue Type: Bug
> Affects Versions: 1.34.0
> Reporter: Leonid Chistov
> Assignee: Leonid Chistov
> Priority: Major
>
> Consider query like
>
> {code:java}
> select r_reason_desc from reason
> where r_reason_desc is not null and r_reason_desc like '%child%'
> {code}
>
> where "r_reason_desc" is a nullable field.
> When RexSimplify::simplifyFilterPredicates is called on that conjunction of
> expressions, expression is not simplified, meaning that redundant "is not
> null" check is not removed.
> In the same time, if query like
> {code:java}
> select r_reason_desc from reason
> where r_reason_desc is not null and r_reason_desc >= 'A'{code}
> is passed to optimizer, redundant "is not null" check is eliminated.
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