"MIXED" binlog format support

[CrazyNash]

Feature Request

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

Describe the feature you'd like:

Customer MySQL instance runs with "MIXED" binlog format, and can't change for some reasons like master-slave set up already. Customer wants to sync data to TiDB, DM doesn't support this now.

Describe alternatives you've considered:

Teachability, Documentation, Adoption, Migration Strategy:

[csuzhangxc]

Thank you for your feedback, but we may not support it in the short term.

[IANTHEREAL]

@ericsyh PTAL, I think we can take a closer look at the usage scenario, maybe it's a general case

[YouhuaLi]

I need this feature strongly.

[lance6716]

MIXED binlog format may write original SQL in binlog, a DELETE ... id > xxx should be faster than DELETE per row, and this will improve synchronize speed.