executor: stable tests

[xhebox]

Signed-off-by: xhe xw897002528@gmail.com

What problem does this PR solve?

Problem Summary: Reported by @tiancaiamao . Need a sleep to wait for table creation, otherwise stale reads may read the old table in the unistore on disks, using the new infoschema, on some really fast computers.

This PR is tested more than 1000 runs on my laptop. It should be stable enough now.

Check List

Tests

• Unit test
• Integration test

Release note

• No release note

[nolouch]

lgtm

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• Yisaer
• nolouch

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[nolouch]

/merge

[ti-chi-bot]

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

Commit hash: b3d7b0e

[ti-chi-bot]

@xhebox: Your PR was out of date, I have automatically updated it for you.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