statistics: add test for analyze single partition

[rebelice]

What problem does this PR solve?

Problem Summary:

Add a test to verify the two behaviors：

1. When analyzing a single partition, we will try to build global stats. If another partition doesn't have stats, be failed and return warnings.
2. After analyzing a single partition, we should have stats in mysql.stats_fm_sketch

Check List

Tests

• Unit test

Side effects

Release note

• No release note

[rebelice]

/sig planner

[rebelice]

/cc @qw4990

[rebelice]

/cc @Reminiscent

[Reminiscent]

Please fix the failed test. Rest LGTM

[Reminiscent]

/LGTM

[qw4990]

/LGTM

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• Reminiscent
• qw4990

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[qw4990]

/merge

[ti-chi-bot]

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

Commit hash: acb16de

[ti-chi-bot]

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[qw4990]

/merge