[jira] [Commented] (CALCITE-2438) RexCall#isAlwaysTrue return incorrect result

[Vladimir Sitnikov (JIRA)]

    [ 
https://issues.apache.org/jira/browse/CALCITE-2438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16567490#comment-16567490
 ] 

Vladimir Sitnikov commented on CALCITE-2438:
--------------------------------------------

Here's a test case (to be placed in {{RexProgramTest}}):
{code:java}
  @Test public void testAlwaysTrueFalse() {
    RelDataType in = typeFactory.createSqlType(SqlTypeName.BOOLEAN);

    SqlPostfixOperator[] operators = new SqlPostfixOperator[]{
        SqlStdOperatorTable.IS_FALSE,
        SqlStdOperatorTable.IS_NOT_FALSE,
        SqlStdOperatorTable.IS_TRUE,
        SqlStdOperatorTable.IS_NOT_TRUE,
        SqlStdOperatorTable.IS_NULL,
        SqlStdOperatorTable.IS_NOT_NULL,
        SqlStdOperatorTable.IS_UNKNOWN,
        SqlStdOperatorTable.IS_NOT_UNKNOWN
    };

    for(boolean argNullability: new boolean[]{true, false}) {
      RexInputRef arg = rexBuilder.makeInputRef(
          typeFactory.createTypeWithNullability(
              in, argNullability),
          0);
      for (SqlPostfixOperator op1 : operators) {
        RexNode n1 = rexBuilder.makeCall(op1, arg);
        checkTrueFalse(n1);
        for (SqlPostfixOperator op2 : operators) {
          RexNode n2 = rexBuilder.makeCall(op2, n1);
          checkTrueFalse(n2);
          for (SqlPostfixOperator op3 : operators) {
            RexNode n3 = rexBuilder.makeCall(op3, n2);
            checkTrueFalse(n3);
            for (SqlPostfixOperator op4 : operators) {
              RexNode n4 = rexBuilder.makeCall(op4, n3);
              checkTrueFalse(n4);
            }
          }
        }
      }
    }
  }

  private void checkTrueFalse(RexNode node) {
    RexNode opt = this.simplify.simplify(node);
    if (trueLiteral.equals(opt)) {
      assertFalse(node.toString() + " optimizes to TRUE, isAlwaysFalse MUST not 
be true",
          node.isAlwaysFalse());
      assertTrue(node.toString() + " optimizes to TRUE, isAlwaysTrue MUST be 
true",
          node.isAlwaysTrue());
    }
    if (falseLiteral.equals(opt)) {
      assertFalse(node.toString() + " optimizes to FALSE, isAlwaysTrue MUST not 
be true",
          node.isAlwaysTrue());
      assertTrue(node.toString() + " optimizes to FALSE, isAlwaysFalse MUST be 
true",
          node.isAlwaysFalse());
    }
    if (nullLiteral.equals(opt)) {
      assertFalse(node.toString() + " optimizes to NULL, isAlwaysTrue MUST not 
be true",
          node.isAlwaysTrue());
      assertFalse(node.toString() + " optimizes to NULL, isAlwaysFalse MUST not 
be true",
          node.isAlwaysFalse());
    }
  }
{code}

> RexCall#isAlwaysTrue  return incorrect result
> ---------------------------------------------
>
>                 Key: CALCITE-2438
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2438
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 1.17.0
>            Reporter: pengzhiwei
>            Assignee: Julian Hyde
>            Priority: Critical
>         Attachments: 屏幕快照 2018-08-02 下午7.26.20.png, 屏幕快照 2018-08-02 
> 下午7.34.26.png
>
>
> In the expression as followed:
> {code:java}
> ((sal IS NULL) IS NOT NULL) IS FALSE
> {code}
> The RexCall#isAlwaysTrue return true,however the correct answer is false.
> I find the reason is that there is a wrong logic in the  isAlwaysTrue,when 
> getKind() is IS_NOT_FALSE、IS_FALSE and IS_NOT_FALSE :
> !屏幕快照 2018-08-02 下午7.34.26.png!
> Can you have a check for me,thanks!



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