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https://issues.apache.org/jira/browse/CALCITE-6982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17947075#comment-17947075
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Julian Hyde edited comment on CALCITE-6982 at 4/24/25 3:28 PM:
---------------------------------------------------------------
This is a logical rewrite rule, not something that should be done during SQL
generation. The same rewrite rule would apply to many other operators where
{{f\(x) IS NULL}} iff {{x IS NULL}}. Use {{class Strong}}.
was (Author: julianhyde):
This is a logical rewrite rule, not something that should be done during SQL
generation. The same rewrite rule would apply to many other operators where
{{f(x) IS NULL}} iff {{x IS NULL}}. Use {{class Strong}}.
> Removes cast from string support with IS_NULL/IS_NOT_NULL
> ---------------------------------------------------------
>
> Key: CALCITE-6982
> URL: https://issues.apache.org/jira/browse/CALCITE-6982
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.39.0
> Reporter: Yu Xu
> Assignee: Yu Xu
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.40.0
>
>
> SQL
> {code:java}
> select \"employee_id\" from \"foodmart\".\"employee\"
> where 10 is distinct from cast('10' as int){code}
> would covert to
> {code:java}
> SELECT \"employee_id\"\nFROM \"foodmart\".\"employee\"\nWHERE (10 IS NOT NULL
> OR CAST('10' AS INTEGER) IS NOT NULL) AND 10 = '10' IS NOT TRUE {code}
> here CAST('10' AS INTEGER) IS NOT NULL : cast is not necessary
> should convert to:
> {code:java}
> SELECT \"employee_id\"\n FROM \"foodmart\".\"employee\"\n WHERE (10 IS NOT
> NULL OR '10' IS NOT NULL) AND 10 = '10' IS NOT TRUE{code}
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