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https://issues.apache.org/jira/browse/CALCITE-1413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15549256#comment-15549256
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Jesus Camacho Rodriguez commented on CALCITE-1413:
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Thanks for the pointer [~julianhyde]; I will take a look and try to integrate
it with the code that I already have. Btw, note that I do not intend to include
this in 1.10.0; I consider it a bit 'risky' since a small mistake can lead to
incorrect results, so I prefer to defer it to next release to have some extra
time.
> New CASE statement simplification
> ---------------------------------
>
> Key: CALCITE-1413
> URL: https://issues.apache.org/jira/browse/CALCITE-1413
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.9.0
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Fix For: 1.11.0
>
>
> Another possible simplification for CASE statements that return boolean
> values.
> {code:sql}
> CASE
> WHEN p1 THEN e1
> WHEN p2 THEN e2
> ELSE TRUE
> END
> {code}
> where e1...en are boolean expressions, can be rewritten into:
> {code:sql}
> (p1 and e1) or (p2 and e2 and not(p1)) or (not(p1) and not(p2))
> {code}
> if p1...pn cannot be nullable.
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