ydb/yt/yql/tests/sql/suites/window/input_optkey1.txt

{"key"=1; "optkey"=1; value="1" };
{"key"=2; "optkey"=2; value="2" };
{"key"=3; "optkey"=3; value="3" };
{"key"=4; "optkey"=4; value="4" };
{"key"=5; "optkey"=#; value="null"};