[Bugfix][JDBC、CDC] Fix Spliter Error in Case of Extensive Duplicate Data

[ic4y]

Purpose of this pull request

It solves the problem that after sampling with segmentation algorithm, the segmentation range is repeated because the result is not deduplicated.

Does this PR introduce any user-facing change?

How was this patch tested?

Check list

• If any new Jar binary package adding in your PR, please add License Notice according
  New License Guide
• If necessary, please update the documentation to describe the new feature. https://github.com/apache/seatunnel/tree/dev/docs
• If you are contributing the connector code, please check that the following files are updated:
  1. Update change log that in connector document. For more details you can refer to connector-v2
  2. Update plugin-mapping.properties and add new connector information in it
  3. Update the pom file of seatunnel-dist
• Update the release-note.

[Hisoka-X]