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https://issues.apache.org/jira/browse/CALCITE-5430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17675728#comment-17675728
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Oliver Lee commented on CALCITE-5430:
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Hi [~julianhyde] I updated the PR to follow {{NVL's}} pattern.
The {{VARCHAR(3)}} NOT NULL tests did fix after that.
> Implement IFNULL() for BigQuery dialect
> ---------------------------------------
>
> Key: CALCITE-5430
> URL: https://issues.apache.org/jira/browse/CALCITE-5430
> Project: Calcite
> Issue Type: Improvement
> Reporter: Oliver Lee
> Assignee: Oliver Lee
> Priority: Trivial
>
> Implementing IFNULL() for BIG_QUERY dialect
>
> IFNULL(expr, null_result)
> If {{expr}} evaluates to {{{}NULL{}}}, returns {{{}null_result{}}}.
> Otherwise, returns expr. If {{expr}} doesn't evaluate to {{{}NULL{}}},
> {{null_result}} isn't evaluated.
> [https://cloud.google.com/bigquery/docs/reference/standard-sql/conditional_expressions#ifnull]
>
>
> example:
> {{ifnull(null, 5)}} -> returns 5
> {{ifnull(1,2)}} -> returns 1
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