Increase the priority of DDL in bootstrap

[zimulala]

We need to execute some DDLs in bootstrap when we do the rolling upgrade.
Now if there are some DDLs doesn't execute before the rolling upgrade，we will execute these DDLs first. If these DDLs have an operation of "add index" and its table have a large number of rows, this will make the progress of bootstrap take a long time if we also have an "add index" in bootstrap.
So we'd better increase the priority of DDL in bootstrap.

Mentor(s)

• @zimulala

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Recommended Skills

• DDL
• Golang

Learning Materials

MySQL's document for syntax reference.
TiDB DDL architecture