SennoYuki

fix "Undefined offset" notice in _applyGSUBrulesIndic()

5

reproduce this bug ```php

support check conn.QueryRow() without Scan()

1

I meet the case that someone write ```go if err := conn.QueryRow(query, args...).Error(); err != nil { } ``` the conn leaks. In fact, he wants to Exec(query, args...). I...

[Bug] Delayed Message cursor lost after topic unload

15

### Search before asking - [X] I searched in the [issues](https://github.com/apache/pulsar/issues) and found nothing similar. ### Read release policy - [X] I understand that unsupported versions don't get bug fixes....