session: add physical table placement_policy in mysql schema

[AilinKid]

Signed-off-by: ailinkid [email protected]

What problem does this PR solve?

Issue Number: close part of #26580
Design table in mysql.* for persisting placement policies

What is changed and how it works?

What's Changed:
add physical table mysql.placement_policy to store the placement policy.
add this create table ddl both in the upgrade and bootstrap phase.

Check List

Tests

• Unit test
• Integration test

Release note

session: add physical table placement_policy in mysql schema.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• morgo
• xhebox

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[morgo]

This test is failing:

[2021-08-10T05:12:36.524Z] infoschema_reader_test.go:917:
[2021-08-10T05:12:36.524Z]     c.Assert(len(tk.MustQuery("select TABLE_NAME from information_schema.TABLE_STORAGE_STATS where TABLE_SCHEMA = 'mysql';").Rows()), Equals, 24)
[2021-08-10T05:12:36.524Z] ... obtained int = 25
[2021-08-10T05:12:36.524Z] ... expected int = 24

[morgo]

Looking good, minor comment.

[AilinKid]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 79a4ded

[AilinKid]

/run-all-tests

[AilinKid]

/merge

[AilinKid]

/merge

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