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https://issues.apache.org/jira/browse/CALCITE-5770?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17755197#comment-17755197
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Tanner Clary commented on CALCITE-5770:
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Hi [~FrankZou] I have a PR for this, I'm going to update the description to
match other function implementations if that's alright. Please feel free to
chime in on the review!
> Implement SAFE_SUBTRACT function (enabled for BigQuery)
> -------------------------------------------------------
>
> Key: CALCITE-5770
> URL: https://issues.apache.org/jira/browse/CALCITE-5770
> Project: Calcite
> Issue Type: Sub-task
> Reporter: Dan Zou
> Assignee: Dan Zou
> Priority: Major
>
> Add support for SAFE_SUBTRACT in BigQuery.
> SAFE_SUBTRACT: Equivalent to the addition operator '-', but returns NULL if
> overflow occurs.
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