InsertQuery   (children 2)
 Identifier test_null_as_default__fuzz_46
 SelectWithUnionQuery (children 1)
  ExpressionList (children 2)
   SelectQuery (children 1)
    ExpressionList (children 2)
     Literal UInt64_1
     Literal NULL
   SelectQuery (children 1)
    ExpressionList (children 2)
     Literal UInt64_2
     Literal NULL
