[
https://issues.apache.org/jira/browse/CALCITE-2469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16583069#comment-16583069
]
Julian Hyde commented on CALCITE-2469:
--------------------------------------
[~vlsi], I don't see how that works. negateNullSafe helps to simplify "not(x is
null)", or more generally, "not(f(x))" for a variety of "f". But it doesn't
help with "(not x) is null".
> RexSimplify should not optimize 'not(x) is null' to 'x is not null
> ------------------------------------------------------------------
>
> Key: CALCITE-2469
> URL: https://issues.apache.org/jira/browse/CALCITE-2469
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.17.0
> Reporter: pengzhiwei
> Assignee: Julian Hyde
> Priority: Critical
>
> The RexSimplify will optimize the 'not（x) is null' to 'x is not null'.
> However,this is incorrect.It is same to the case 'not（x） is not null' .
>
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
