SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function CAST (children 1)
     ExpressionList (children 2)
      Literal \'{"a" : 42}\'
      Literal \'Nullable(JSON)\'
   ExpressionList (children 1)
    Literal UInt64_1
