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  1. camunda BPM
  2. CAM-11269

In Scala FEEL Engine, unary-test comparison without braces cannot be evaluated

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Details

    • Bug Report
    • Status: Closed
    • L3 - Default
    • Resolution: Fixed
    • 7.13.0
    • 7.17.0, 7.15.8, 7.16.2, 7.17.0-alpha1
    • None
    • None

    Description

      Steps to reproduce
      Evaluate the expression 8 > 7 as unary test

      Observed behavior
      The following error message is shown:

      failed to parse expression '8 > 7': [1.3] failure: end of input expected

      Expected behavior

      • The expression can be evaluated
      • No error message is shown

      Alternative Solution
      The expression (8 > 7) can be evaluated successfully

      Is this a bug according to the DMN FEEL 1.2 specification?

      • Yes!
      • The DMN 1.1 spec on pg. 105 ("10.3.1.2 Grammar rules") says:
      • The DMN 1.1 spec on pg. 107 ("10.3.1.2 Grammar rules") says:
      • Simple positive unary tests do not need any braces
      • The structure of a comparison is: expression , ( "=" | "!=" | "<" | "<=" | ">" | ">=" ) , expression
        • The braces in the grammar rule are used to express that one of the allowed comparison keywords can be used
        • "Language keywords are enclosed in double quotes in the grammar rules" cf. pg. 107

      Hint

      • The failing expression can be used as simple expression.
      • Unignore test case [1]

      Estimation
      Unknown, it works when variables are compared and in output entries.

      [1] https://github.com/camunda/camunda-bpm-platform/blob/master/engine-dmn/engine/src/test/java/org/camunda/bpm/dmn/engine/feel/BreakingScalaFeelBehaviorTest.java#L61-L71

      mgm-controller-panel

        This is the controller panel for Smart Panels app

        Attachments

          1. FeelLegacy_equals_boolean.dmn
            1 kB
            Tassilo Weidner
          2. Screenshot 2020-02-25 at 15.24.35.png
            23 kB
            Tassilo Weidner
          3. Screenshot 2020-02-25 at 15.25.49.png
            37 kB
            Tassilo Weidner

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                miklas.boskamp Miklas Boskamp
                tassilo.weidner Tassilo Weidner
                Miklas Boskamp Miklas Boskamp
                Tassilo Weidner Tassilo Weidner
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                Dates

                  Created:
                  Updated:
                  Resolved:

                  Salesforce