[MINOR] refactor: avoid unnecessary bitmap clone and AND

[EnricoMi]

What changes were proposed in this pull request?

Add note that processedBlockIds can be a superset of blockIdBitmap. Add quick check if processedBlockIds is equal to blockIdBitmap. In that case, there is no need to clone and AND the bitmaps.

Why are the changes needed?

The logic is equivalent but more performant when processedBlockIds is not a superset of blockIdBitmap (when no other blocks than the blockIdBitmap are retrieved).

Does this PR introduce any user-facing change?

No.

How was this patch tested?

Existing tests in ShuffleReadClientImplTest cover this.

[xianjingfeng]

LGTM. Thanks @EnricoMi

[codecov-commenter]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (5d027c0) 53.38% compared to head (545da70) 54.29%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
.../java/org/apache/uniffle/common/util/RssUtils.java	0.00%	7 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1442      +/-   ##
============================================
+ Coverage     53.38%   54.29%   +0.91%     
- Complexity     2729     2730       +1     
============================================
  Files           422      402      -20     
  Lines         24046    21686    -2360     
  Branches       2051     2051              
============================================
- Hits          12836    11775    -1061     
+ Misses        10412     9185    -1227     
+ Partials        798      726      -72     

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[zuston]

LGTM. +1

[zuston]

Thanks @EnricoMi for your contribution.

Welcome to Apache Uniffle community 👏🏻