[jira] [Commented] (CALCITE-6440) SortRemoveConstantKeysRule should remove NULL literal sort keys (e.g. ORDER BY NULL)

["Caican Cai (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-6440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17861183#comment-17861183 ] 

Caican Cai commented on CALCITE-6440:
-------------------------------------

[~julianhyde] Thank you Julian for your answer. The current SortRemoveConstantKeysRule can already do this, but what I want to do is to delete. but what I want to do is to delete this layer of redundant Project.

{code:java}
LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4], SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8], EXPR$9=[null:NULL]) {code}
It seems that it is not suitable to add a RelOptRule to do this. I will see if calcite has similar functions. If not, I will try to improve it.

Close this jira first. After I find a suitable solution, I will reopen this jira and modify the summary.

> SortRemoveConstantKeysRule should remove NULL literal sort keys (e.g. ORDER BY NULL)
> ------------------------------------------------------------------------------------
>
>                 Key: CALCITE-6440
>                 URL: https://issues.apache.org/jira/browse/CALCITE-6440
>             Project: Calcite
>          Issue Type: New Feature
>          Components: core
>    Affects Versions: 1.37.0
>            Reporter: Caican Cai
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.38.0
>
>
> For the following SQL:
> {code:java}
> select * from task order by null; {code}
> We could rewrite it to:
> {code:java}
>  select * from task;{code}



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