[CAM-11269] In Scala FEEL Engine, unary-test comparison without braces cannot be evaluated - camunda JIRA

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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

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.

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

is caused by

CAM-11184 Add support for full FEEL 1.2 feature set

is related to

CAM-11282 Identify breaking changes due to different type handling