Add CannotInsertFlag to indicate that this table cannot be inserted

[7yyo]

What problem does this PR solve?

Include no_zero_date in sqlmode, these scenarios should fail to add column:

create table t (id int);
insert into t values(1);
alter table t add column a date not null;
alter table t add column a date not null;

Considering that data may be written during the DDL state change phase, need a flag to prevent data insert during this period. So add this table level flag.

What is changed and how it works?

Check List

Tests

• No code

Code changes

• Has exported variable/fields change

Side effects

Related changes

[7yyo]

@bb7133 PTAL

[ti-chi-bot]

@7yyo: PR needs rebase.

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