SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function less (children 1)
     ExpressionList (children 2)
      Literal \'ab\\0c\'
      Literal \'ab\\0d\'
    Function greater (children 1)
     ExpressionList (children 2)
      Literal \'ab\\0c\'
      Literal \'ab\\0d\'
