Doctrine 2 - ORM
  1. Doctrine 2 - ORM
  2. DDC-1079

Behavior of Doctrine 2 is not as defined by EBNF definition for SimpleSelectExpression

    Details

    • Type: Bug Bug
    • Status: Resolved
    • Priority: Minor Minor
    • Resolution: Fixed
    • Affects Version/s: 2.0.2
    • Fix Version/s: 2.0.4
    • Component/s: None
    • Security Level: All
    • Labels:
      None

      Description

      Queries like

      SELECT COUNT(a)
        FROM \a a
       WHERE EXISTS (SELECT 0
            		 FROM \b b
                      WHERE b.a = a)
      

      will not work, whereas they should.

      Assume that there are potentially millions of b's per a, so this should not be joined, just simply left as-is as a correlated subquery within an exists expression. Actually, a "LIMIT 1" at the end of the subquery would come in handy here, too.

      Doctrine 2 will give an error message

      [Syntax Error] line 0, col [...]: Error: Expected known function, got '0''

      when parsing the DQL statement.

      According to the EBNF definition, 0 qualifies as a Literal, which qualifies as an ArithmeticPrimary, which qualifies as an ArithmeticFactor, which qualifies as an ArithmeticTerm, which qualifies as a SimpleArithmeticExpression, which qualifies as a ScalarExpression, which qualifies as a SimpleSelectExpression, which should be perfectly legitimate in that position.

      This is yet another annoying case of the Doctrine 2 documentation not matching the behavior of the actual implementation.

      Fortunately, it is easy to work around this defect by selecting some field and sacrificing a bit of performance, but then again, it sucks to have to continuously implement workarounds.

        Activity

          People

          • Assignee:
            Benjamin Eberlei
            Reporter:
            Daniel Alvarez Arribas
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            Dates

            • Created:
              Updated:
              Resolved: