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https://issues.apache.org/jira/browse/CALCITE-4806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17423623#comment-17423623
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duan xiong commented on CALCITE-4806:
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[~julianhyde] In the SQL Standard describe this:
{code:java}
The choice of whether to round or truncate is implementation-defined.{code}
So according to the SQL Standard, It looks like not a problem.
But The other databases like PostgreSQL、MySQL、Oracle are the same result.
> 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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