SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function CrC32 (children 1)
     ExpressionList (children 1)
      Literal \'string\'
    Function crc32 (children 1)
     ExpressionList (children 1)
      Literal \'test\'