SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 4)
    Function CAST (alias json) (children 1)
     ExpressionList (children 2)
      Literal \'{"a.b" : 42, "a" : {"b" : "Hello World!"}}\'
      Literal \'JSON\'
    Identifier json.a%2Eb
    Identifier json.a.b
    Identifier json.a.b
