anchor.diff:      | columnName
       | simpleExpr collateClause
       //| param_marker
  -    //| variable
  +    | variable
       | simpleExpr AND_ simpleExpr
       | PLUS simpleExpr
       | MINUS simpleExpr
  
positive.code:     : matchNone
      ;
      
  liter
      : question
      | number
  
negative.code:     | bitExpr MOD bitExpr
      | bitExpr MOD_ bitExpr
      | bitExpr BIT_EXCLUSIVE_OR bitExpr
      | bitExpr PLUS intervalExpr
      | bitExpr MINUS intervalExpr
      | simpleExpr
      ;
      
  