pb: update pb parser to avoid drainer failure

[lichunzhu]

What problem does this PR solve?

close #1117.
When drainer syncing to pb meeting some unknown ddls, drainer will fail because of the unknown DDL.

What is changed and how it works?

Ignore this pb error when checking whether ddl is CreateDatabaseStmt

Check List

Tests

• Unit test
• Integration test

Code changes

• Has exported function/method change
• Has exported variable/fields change

Release note

• No release note

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• glorv
• lance6716

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[lichunzhu]

/run-all-tests

[lichunzhu]

/run-all-tests

[lichunzhu]

/run-all-tests

[lichunzhu]

/merge

[ti-chi-bot]

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

Commit hash: 8cba8b7

[lichunzhu]

/run-all-tests

[lichunzhu]

/run-all-tests

[lichunzhu]

/merge

[ti-chi-bot]

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

Commit hash: e6d0e5d

[lichunzhu]

/run-all-tests

[ti-chi-bot]

@lichunzhu: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/run-all-tests

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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[lichunzhu]

/run-all-tests

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #1121.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #1122.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #1123.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #1124.

[ti-chi-bot]

In response to a cherrypick label: cannot checkout 5.3: error checking out 5.3: exit status 1. output: error: pathspec '5.3' did not match any file(s) known to git

[ti-chi-bot]

In response to a cherrypick label: cannot checkout 5.4: error checking out 5.4: exit status 1. output: error: pathspec '5.4' did not match any file(s) known to git