Fix rename-command didn't work when using it multiple times

[tanruixiang]

This close #1040

[PragmaTwice]

https://github.com/apache/incubator-kvrocks/blob/debd8988d6f6978593ad35b7e06d0c3e773ee825/src/config/config.cc#L767-L771

Since ALL MultiStringField cannot be rewritten, so I think you need to change it to something like

if (iter->second.IsMulti())

in case of someone use MultiStringField but forget to include the config key in this check.

[git-hulk]

https://github.com/apache/incubator-kvrocks/blob/debd8988d6f6978593ad35b7e06d0c3e773ee825/src/config/config.cc#L767-L771

Since ALL MultiStringField cannot be rewritten, so I think you need to change it to something like

if (iter->second.IsMulti())

in case of someone use MultiStringField but forget to include the config key in this check.

Yes, that's right.

[git-hulk]

Thanks @tanruixiang @PragmaTwice, merging...