SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 3)
    Function CAST (alias json) (children 1)
     ExpressionList (children 2)
      Literal \'{"a.b" : 42, "a" : {"b" : "Hello World!"}}\'
      Literal \'JSON(`a%2Eb` UInt8)\'
    Identifier json.a%2Eb
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Identifier json.a%2Eb
