[
https://issues.apache.org/jira/browse/CALCITE-1953?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Julian Hyde updated CALCITE-1953:
---------------------------------
Summary: Reducing NOT() should not collapse NOT(IS_TRUE) to IS_FALSE for
nullable inputs (was: Reducing NOT() should not collaose NOT(IS_TRUE) to
IS_FALSE for nullable inputs)
> Reducing NOT() should not collapse NOT(IS_TRUE) to IS_FALSE for nullable
> inputs
> -------------------------------------------------------------------------------
>
> Key: CALCITE-1953
> URL: https://issues.apache.org/jira/browse/CALCITE-1953
> Project: Calcite
> Issue Type: Bug
> Reporter: MinJi Kim
> Assignee: Julian Hyde
> Fix For: 1.14.0
>
>
> In RexSimplify, when simplifying NOT(), we negate the input expression. But
> for IS_FALSE/IS_TRUE/IS_NOT_FALSE/IS_NOT_TRUE this cannot be just negated if
> the input is nullable.
> {code}
> IS_FALSE(null) = false
> IS_TRUE(null) = false
> NOT(IS_FALSE(null)) = true != IS_TRUE(null)
> IS_NOT_FALSE(null) = true
> IS_NOT_TRUE(null) = true
> NOT(IS_NOT_FALSE(null)) = false != IS_NOT_TRUE(null)
> {code}
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
