[jira] [Updated] (CALCITE-2848) Simplifying a case statement's first branch should ignore its safety

["Zoltan Haindrich (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-2848?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zoltan Haindrich updated CALCITE-2848:
--------------------------------------
    Summary: Simplifying a case statement's first branch should ignore its safety  (was: Simplifying a case statement's first branch should disregard its safety)

> Simplifying a case statement's first branch should ignore its safety
> --------------------------------------------------------------------
>
>                 Key: CALCITE-2848
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2848
>             Project: Calcite
>          Issue Type: Improvement
>            Reporter: Zoltan Haindrich
>            Assignee: Zoltan Haindrich
>            Priority: Major
>
> Example: a very simple CASE which is not get rewritten because the first condition branch contains an unknown UDF
> {code:sql}
> CASE
>  WHEN to_date('2001-11-11') = '2000' THEN true
>  ELSE false
> END
> {code}
> This expression right now retained as is; because the "to_date" was an unknown UDF; but since the first branch of a CASE is always evaluated and that could unlock the rewrite of this case to it's boolean form.



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