SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function CAST (children 1)
     ExpressionList (children 2)
      Function map (children 1)
       ExpressionList (children 6)
        Function tuple (children 1)
         ExpressionList (children 1)
          Literal \'{"a":1,"b":1,"b":1}\'
        Literal UInt64_1
        Function tuple (children 1)
         ExpressionList (children 1)
          Literal \'{"a":1}\'
        Literal UInt64_2
        Function tuple (children 1)
         ExpressionList (children 1)
          Literal \'{"a":1,"c":1}\'
        Literal UInt64_2666514966
      Literal \'Map(Tuple(JSON(max_dynamic_paths = 2)), Variant(UInt32))\'
   Set