SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function cityHash64 (children 1)
     ExpressionList (children 1)
      Function array (children 1)
       ExpressionList (children 2)
        Literal Tuple_(UInt64_1, \'c\')
        Literal Tuple_(UInt64_2, \'b\')