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Posted to issues@calcite.apache.org by "Julian Hyde (JIRA)" <ji...@apache.org> on 2019/02/05 00:06:00 UTC

[jira] [Commented] (CALCITE-2823) Prevent optimization of non-deterministic functions

    [ https://issues.apache.org/jira/browse/CALCITE-2823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16760332#comment-16760332 ] 

Julian Hyde commented on CALCITE-2823:
--------------------------------------

Can you define 'deterministic', and give examples? What about 'dynamic'?

> Prevent optimization of non-deterministic functions
> ---------------------------------------------------
>
>                 Key: CALCITE-2823
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2823
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>            Reporter: Siddharth Teotia
>            Assignee: Julian Hyde
>            Priority: Major
>
> RexSimplify and RexProgram optimize expressions like A() = A() to true, but if A() is a non-deterministic expression, this optimization is invalid. Change RexSimplify and RexProgram to check if expression is deterministic or not, in order to decide about the optimization.



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