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https://issues.apache.org/jira/browse/CALCITE-7044?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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xiong duan resolved CALCITE-7044.
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Fix Version/s: 1.41.0
Assignee: xiong duan
Resolution: Fixed
> Add internal operator NOT NULL to enhance rewrite COALESCE operator
> -------------------------------------------------------------------
>
> Key: CALCITE-7044
> URL: https://issues.apache.org/jira/browse/CALCITE-7044
> Project: Calcite
> Issue Type: Bug
> Reporter: xiong duan
> Assignee: xiong duan
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.41.0
>
>
> Add internal operator NOT NULL to enhance rewrite COALESCE operator.
> This issue originated from the discussion of CALCITE-6978.
> A new NOT NULL internal operator was added, indicating that this expression
> will never be NULL.
> The expression coalesce(a,b) can be transformed into CASE WHEN a is not null
> THEN NOT NULL(a) ELSE b
> 1) `not null` operator doesn't do anything, just tell the validator this
> filed is not null.
> 2) When we do RelToSQL, we can ignore it directly.
> Notice:If the query contains nondeterministic function calls, like RANDOM.
> Duplicating such will produce different results,
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