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https://issues.apache.org/jira/browse/CALCITE-5659?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17714231#comment-17714231
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Oliver Lee commented on CALCITE-5659:
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That's a good point Julian.
Based on the comment above about requiring parentheses around expressions it
seems that was put in place intentionally.
We could close this PR+ticket.
What are the complications if we relax the requirement for parentheses?
> Allow CAST in an INTERVAL definition
> -------------------------------------
>
> Key: CALCITE-5659
> URL: https://issues.apache.org/jira/browse/CALCITE-5659
> Project: Calcite
> Issue Type: Bug
> Reporter: Oliver Lee
> Assignee: Oliver Lee
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Running queries that contain a CAST as part of the INTERVAL definition is
> throwing a parser error.
> i.e.
> {{INTERVAL CAST(5 as int64) YEAR}}
> We can make parser changes to allow the Cast function tokens to be accepted
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