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https://issues.apache.org/jira/browse/CALCITE-5455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17651429#comment-17651429
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Oliver Lee commented on CALCITE-5455:
-------------------------------------
Actually, it's already been implemented. I'll just add to quidem tests some
test cases in my PR.
> Add NULLIF() for BIG_QUERY
> --------------------------
>
> Key: CALCITE-5455
> URL: https://issues.apache.org/jira/browse/CALCITE-5455
> Project: Calcite
> Issue Type: Improvement
> Reporter: Oliver Lee
> Assignee: Oliver Lee
> Priority: Minor
>
> Adding NULLIF() for BIG_QUERY
> [https://cloud.google.com/bigquery/docs/reference/standard-sql/functions-and-operators#nullif]
>
>
> NULLIF(expr, expr_to_match)
> {quote}Returns {{NULL}} if {{expr = expr_to_match}} evaluates to
> {{{}TRUE{}}}, otherwise returns {{{}expr{}}}.
> {quote}
> NULLIF(0, 0) -> NULL
> NULLIF(10,0) -> 10
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