Refine log for huge GTID sets

[csuzhangxc]

Feature Request

Is your feature request related to a problem? Please describe:

very huge GTID sets may exist with XA transactions. an example is in the following log.

gtid.log

Describe the feature you'd like:

better log for GTID sets.

BTW, we may need to learn more about XA transactions, and check whether we can combine/simply GTID sets

like simply 415965999:415966003:415966005-415966007 to 415965999-415966007.

Describe alternatives you've considered:

Teachability, Documentation, Adoption, Migration Strategy:

[lance6716]

Now DM should support gap in GTID sets, so close this request

[lance6716]

Oh that's too big a line, now I think we should find a way to better display it 😂