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https://issues.apache.org/jira/browse/CALCITE-7438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18064305#comment-18064305
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terran2010 commented on CALCITE-7438:
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[~julianhyde] Thank you very much for your reply. I will try to optimize nullif
based on your suggestions
> Do not rewrite NULLIF to a CASE expression
> ------------------------------------------
>
> Key: CALCITE-7438
> URL: https://issues.apache.org/jira/browse/CALCITE-7438
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.41.0
> Reporter: terran2010
> Priority: Major
>
> When execute sql：
> {code:java}
> select NULLIF(count(brand_name),1) from product{code}
> Calcite will make the following optimizations:
> {code:java}
> SELECT CASE WHEN COUNT(brand_name) = 1 THEN NULL ELSE COUNT(brand_name) END
> FROM foodmart.product{code}
> During the actual execution of the above SQL, COUNT (brandname) will be
> executed twice. Can we consider disabling this optimization
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