SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function murmurHash2_64 (children 1)
     ExpressionList (children 1)
      Function materialize (children 1)
       ExpressionList (children 1)
        Function array (children 1)
         ExpressionList (children 3)
          Literal Tuple_(UInt64_1, \'a\')
          Literal Tuple_(UInt64_2, \'b\')
          Literal Tuple_(UInt64_3, \'c\')
