docs: Expression XreadAllTypesValueExpressionPrimary(boolean boole) {
  
          Expression e = null;
  
          switch (token.tokenType) {
  
              case Tokens.EXISTS :
              case Tokens.UNIQUE :
                  if (boole) {
                      return XreadPredicate();
                  }
                  break;
  
              case Tokens.ROW :
                  if (boole) {
                      break;
                  }
  
                  read();
                  readThis(Tokens.OPENBRACKET);
  
                  e = XreadRowElementList(true);
  
                  readThis(Tokens.CLOSEBRACKET);
                  break;
  
              default :
                  e = XreadSimpleValueExpressionPrimary();
          }
  
          if (e == null && token.tokenType == Tokens.OPENBRACKET) {
              read();
  
              e = XreadRowElementList(true);
  
              readThis(Tokens.CLOSEBRACKET);
          }
  
          if (boole && e != null) {
              e = XreadPredicateRightPart(e);
          }
  
          return e;
      }