SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function halfMD5 (children 1)
     ExpressionList (children 1)
      Function tuple (children 1)
       ExpressionList (children 4)
        Literal \'a\'
        Literal Array_[UInt64_1, UInt64_2, UInt64_3]
        Literal UInt64_4
        Function tuple (children 1)
         ExpressionList (children 4)
          Literal UInt64_4
          Literal Array_[\'foo\', \'bar\']
          Literal UInt64_1
          Literal Tuple_(UInt64_1, UInt64_2)