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https://issues.apache.org/jira/browse/CALCITE-1794?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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xiong duan updated CALCITE-1794:
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Description:
For Example:
{code:java}
x = 1 and x <> 2{code}
In optimizer procedure, We pull up "x = 1" first, then when we encounter "x <>
2", can be simplified to "x = 1".
{code:java}
x <> 2 and x = 1{code}
When we pull up "x <> 2" first, it can't optimize the "x = 1". So we need SARG
to optimize it again.
Because EQUALS and NOT-EQUALS operator will make the left RexNode become
*[CAST($t0): INTEGER NOT NULL]* when the left node and right node have a least
restrictive type. So we need to handle the CAST operator.
was:
Expressions such as {{$1<>1 and $1=2}} can be simplified to {{{}$1=2{}}}.
Similar {{$1>10 AND $1>20}} can be simplified to {{{}$1>20{}}}. Such
expressions are produced by the proposed solution for CALCITE-1790 (simplify
boolean CASE to complex AND/OR).
Example:
{code:java}
x = 1 and x <> 2{code}
In optimizer procedure, We pull up "x = 1" first, then when we encounter "x <>
2", can be simplified to "x = 1".
{code:java}
x <> 2 and x = 1{code}
When we pull up "x <> 2" first, it can't optimize the "x = 1". So we need SARG
to optimize it again.
> CAST operator prevent SARG to optimize "x <>2 and x = 1"
> --------------------------------------------------------
>
> Key: CALCITE-1794
> URL: https://issues.apache.org/jira/browse/CALCITE-1794
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.29.0
> Reporter: Remus Rusanu
> Assignee: xiong duan
> Priority: Major
> Labels: pull-request-available
> Time Spent: 20m
> Remaining Estimate: 0h
>
>
> For Example:
> {code:java}
> x = 1 and x <> 2{code}
> In optimizer procedure, We pull up "x = 1" first, then when we encounter "x
> <> 2", can be simplified to "x = 1".
> {code:java}
> x <> 2 and x = 1{code}
> When we pull up "x <> 2" first, it can't optimize the "x = 1". So we need
> SARG to optimize it again.
> Because EQUALS and NOT-EQUALS operator will make the left RexNode become
> *[CAST($t0): INTEGER NOT NULL]* when the left node and right node have a
> least restrictive type. So we need to handle the CAST operator.
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