[jira] [Commented] (CALCITE-1794) CAST operator prevent SARG to optimize "x <>2 and x = 1"

["xiong duan (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-1794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17500060#comment-17500060 ] 

xiong duan commented on CALCITE-1794:
-------------------------------------

[~julianhyde]. I have updated the issue description and summary. If you have free time, please review it .

> 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". So the result will be "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.



--
This message was sent by Atlassian Jira
(v8.20.1#820001)