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Posted to issues@calcite.apache.org by "xuyangzhong (Jira)" <ji...@apache.org> on 2021/09/27 06:47:00 UTC

[jira] [Updated] (CALCITE-4806) Lossy CAST is incorrectly simplified

     [ https://issues.apache.org/jira/browse/CALCITE-4806?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

xuyangzhong updated CALCITE-4806:
---------------------------------
    Summary: Lossy CAST is incorrectly simplified  (was: When simplifying 'equals', the data type will be ignore)

> Lossy CAST is incorrectly simplified
> ------------------------------------
>
>                 Key: CALCITE-4806
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4806
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: xuyangzhong
>            Priority: Major
>
> the sql is following:
> {code:java}
> // code placeholder
> select cast(1.1 as int) = cast (1 as int){code}
> In SQLite the result is 1 and in postgreSQL the result is true.
> But in calcite the result is false.
> The bug is in RexSimplify and 1.1 and 1 are all converted to java.lang.Comparable, and 1.1 doesn't equal to 1. It ignores the source data type. The literal 1.1 should be cast to 1(int) first.



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