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https://issues.apache.org/jira/browse/CALCITE-5288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17606637#comment-17606637
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Aleksey Plekhanov commented on CALCITE-5288:
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Transformation to SEARCH is skipped if there is only one interval in SARG (as
far as I understand, for better readability of simple cases like {{{}a > 1 and
a < 3){}}}, but in case we merging SARG that it's already in expression, we
should always proceed with transformation, even if resulted SARG has only one
interval.
> Expression '(a > 1 and a < 3) or (a > 2 and a < 4)' cannot be simplified to
> 'SEARCH(a, Sarg[(1..4)])'
> -----------------------------------------------------------------------------------------------------
>
> Key: CALCITE-5288
> URL: https://issues.apache.org/jira/browse/CALCITE-5288
> Project: Calcite
> Issue Type: Bug
> Reporter: Aleksey Plekhanov
> Assignee: Aleksey Plekhanov
> Priority: Major
>
> If there is only one range in search/sarg after simplification, the result of
> sarg collector is ignored (\{{SargCollector#needToFix()}} method).
> Expression {{(a > 1 and a < 3) or (a > 2 and a < 4)}} is simplified to
> {{OR(SEARCH(a, Sarg[(1..3)]), SEARCH(a, Sarg[(2..4)]))}} but expected
> {{{}SEARCH(a, Sarg[(1..4)]){}}}.
> If there are more the one intervals or if open interval exists, expressions
> simplified as expected.
>
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