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  1. Calcite
  2. CALCITE-4415

SqlStdOperatorTable.NOT_LIKE has a wrong implementor

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 1.27.0
    • Component/s: None

      Description

      SqlStdOperatorTable.NOT_LIKE's implementor defined in RexImpTable is currently the same as LIKE (i.e. NOT_LIKE performs the same operation as LIKE):

      ...
      final MethodImplementor likeImplementor =
              new MethodImplementor(BuiltInMethod.LIKE.method, NullPolicy.STRICT, false);
      map.put(LIKE, likeImplementor);
      map.put(NOT_LIKE, likeImplementor);
      

      It should be:

      ...
      map.put(LIKE, likeImplementor);
      map.put(NOT_LIKE, NotImplementor.of(likeImplementor));
      

      Luckily, SQL queries seem to not suffer the consequences because StandardConvertletTable expands x NOT LIKE y into NOT (x LIKE y), so the issue is avoided:

      // Expand "x NOT LIKE y" into "NOT (x LIKE y)"
      registerOp(SqlStdOperatorTable.NOT_LIKE,
          (cx, call) -> cx.convertExpression(
              SqlStdOperatorTable.NOT.createCall(SqlParserPos.ZERO,
                  SqlStdOperatorTable.LIKE.createCall(SqlParserPos.ZERO,
                      call.getOperandList()))));
      

      However, creating a plan via RelBuilder using SqlStdOperatorTable.NOT_LIKE will lead to incorrect results.

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            • Assignee:
              rubenql Ruben Q L
              Reporter:
              rubenql Ruben Q L
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