[BanyanDB][TestCase] Stimulate the OAP flushing

[hanahmily]

Search before asking

• I had searched in the issues and found no similar feature requirement.

Description

This case tends to stimulate the way of the OAP flushing process:

The testing data contain three sets that belong to the same timestamp(or the time bucket of the OAP). Each one indicates a flushing operation and has the same entities with different values.

• Load three sets.
  • Testing all cases after each is loaded, which could verify the Memtable.
• Load the same three sets, then restart the database after each loading.
  • Verify cases after each restart. They will confirm SSTables and the compaction results.

Use case

No response

Related issues

No response

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[mikechengwei]

Can I try to finish this function?