handle unsigned long in flush operations for star tree

[Shailesh-Kumar-Singh]

Description

This change handles the comparison and sorting of unsigned long values during flush operations. Since unsigned long values are stored as Java Long (and values greater than Long.MAX_VALUE turn negative),Long.compareUnsigned is used to ensure correct sorting and comparison of unsigned long dimensions. This ensures that unsigned long values are properly handled and sorted during flush operations

Related Issues

Issue - Handle unsigned long during flush and merge operations

Check List

• [ ] Functionality includes testing.
• [ ] API changes companion pull request created, if applicable.
• [ ] Public documentation issue/PR created, if applicable.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license. For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[github-actions[bot]]

:x: Gradle check result for 80db308a3095342ceab6f1460206ca80803596ef: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?