vlsi commented on pull request #2238:
URL: https://github.com/apache/calcite/pull/2238#issuecomment-721937766


   @danny0405 , before you commit more fixes to `RexSimplify` could I kindly 
ask you to review the regression which was introduced a year ago 
https://issues.apache.org/jira/browse/CALCITE-3457?focusedCommentId=17224481&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-17224481
 ?
   
   You've committed CALCITE-3457 and it turns out to cause AssertionErrors on 
certain inputs.
   Would you please fix or revert 3457 before you proceed with committing more 
changes to RexSimplify?
   
   ```
   java.lang.AssertionError
        at 
org.apache.calcite.rex.RexSimplify.validateStrongPolicy(RexSimplify.java:903)
        at org.apache.calcite.rex.RexSimplify.simplifyIs2(RexSimplify.java:746)
        at org.apache.calcite.rex.RexSimplify.simplifyIs1(RexSimplify.java:713)
        at org.apache.calcite.rex.RexSimplify.simplifyIs(RexSimplify.java:684)
        at org.apache.calcite.rex.RexSimplify.simplify(RexSimplify.java:295)
        at 
org.apache.calcite.rex.RexSimplify.simplifyOrTerms(RexSimplify.java:567)
        at org.apache.calcite.rex.RexSimplify.simplifyOr(RexSimplify.java:1771)
        at org.apache.calcite.rex.RexSimplify.simplify(RexSimplify.java:276)
        at 
org.apache.calcite.rex.RexSimplify.simplifyComparison(RexSimplify.java:368)
        at 
org.apache.calcite.rex.RexSimplify.simplifyComparison(RexSimplify.java:345)
        at org.apache.calcite.rex.RexSimplify.simplify(RexSimplify.java:302)
        at 
org.apache.calcite.rex.RexSimplify.simplifyUnknownAs(RexSimplify.java:243)
        at 
org.apache.calcite.rex.RexProgramTestBase.checkSimplify3_(RexProgramTestBase.java:134)
        at 
org.apache.calcite.rex.RexProgramTestBase.checkSimplify(RexProgramTestBase.java:93)
        at 
org.apache.calcite.rex.RexProgramTest.reproducerFor3457(RexProgramTest.java:514)
   ```


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