SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function getSubcolumn (children 1)
     ExpressionList (children 2)
      Function CAST (children 1)
       ExpressionList (children 2)
        Function materialize (children 1)
         ExpressionList (children 1)
          Literal \'{"a" : [{"b" : 42}]}\'
        Literal \'JSON\'
      Literal \'a.:`Array(Nullable(JSON(max_dynamic_types=16, max_dynamic_paths=256)))`\'
