executor: Add support information_schema.schemata for placement rule

[sylzd]

What problem does this PR solve?

Issue Number: close #29758

Problem Summary:

What is changed and how it works?

Check List

Tests

• Unit test

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• mjonss
• morgo

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[sylzd]

/run-check_dev_2

[sylzd]

/cc @mjonss @morgo

[mjonss]

LGTM

[morgo]

/merge

[ti-chi-bot]

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

Commit hash: 59fec66

[ti-chi-bot]

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