You are viewing a plain text version of this content. The canonical link for it is here.

Posted to issues@calcite.apache.org by "pengzhiwei (JIRA)" <ji...@apache.org> on 2018/07/02 12:46:00 UTC

[jira] [Created] (CALCITE-2393) RexSimplify optimization error for expression 'x is not null and x <> 5'

pengzhiwei created CALCITE-2393:
-----------------------------------

             Summary: RexSimplify optimization error for expression  'x is not null and x <> 5'
                 Key: CALCITE-2393
                 URL: https://issues.apache.org/jira/browse/CALCITE-2393
             Project: Calcite
          Issue Type: Bug
          Components: core
    Affects Versions: 1.16.0
            Reporter: pengzhiwei
            Assignee: Julian Hyde
             Fix For: 1.17.0


   After the optimization of RexSimplify,the expression 'x is not null and x <> 5' (x is nullable) is optimized to 'x<> 5' (RexSimplify#unknownAsFalse is true).  I think it is not a correct result because when x is null, null<> 5 should return true,while 'x is not null and x <> 5' return false.

  I think the optimization for "is not null" in RexSimplify#simplifyAnd2ForUnknownAsFalse should exclude the case of not-equal operator.

 I really confused with this optimization, can you give some suggestion,thanks! 

 

  

         



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)