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https://issues.apache.org/jira/browse/CALCITE-6397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17845441#comment-17845441
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Mihai Budiu commented on CALCITE-6397:
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The Spark specification should be your guideline.
If SameOperandTypeChecker is the wrong one you should use a different type
checker.
> Add NVL2 function (enabled in Spark library)
> --------------------------------------------
>
> Key: CALCITE-6397
> URL: https://issues.apache.org/jira/browse/CALCITE-6397
> Project: Calcite
> Issue Type: New Feature
> Reporter: Caican Cai
> Priority: Major
> Labels: pull-request-available
>
> Add NVL2 function (enabled in Spark library)
>
> https://spark.apache.org/docs/2.3.0/api/sql/index.html#nvl2
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