Compatible with mysql 5.7 noop variables: innodb_default_row_format

[King-Dylan]

Feature Request

Compatible with mysql 8.0 parameter innodb_default_row_format

Is your feature request related to a problem? Please describe:
jira is required for innodb_default_row_format = dynamic

Describe the feature you'd like:
user can set innodb_default_row_format and can use set variables change value

Describe alternatives you've considered:

Teachability, Documentation, Adoption, Migration Strategy:

[djshow832]

As the row format is not suitable for TiKV, does it mean TiDB can allow users to set its value and just ignore it?

[King-Dylan]

As the row format is not suitable for TiKV, does it mean TiDB can allow users to set its value and just ignore it?

yes

[morgo]

I agree in this instance it is fine to ignore. What JIRA is doing is a little bit silly:

• innodb_default_row_format was introduced in 5.7 where the default is DYNAMIC. Prior to this, you needed to specify the row format per-table (and at that time it defaulted to compact)
• JIRA is setting it to DYNAMIC, very likely to ensure that indexes on varchar(255) + utf8mb4 are supported. So it is essentially only handling the case that a user might change the default (users rarely would).

[morgo]

@King-Dylan I have a PR available to fix this, but I've not tagged it for cherry picking to a release branch. Let's chat on Feishu/Slack if you would like it to be.