added shuffle in between reader and writer

[sm745052]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @sm745052, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request integrates a Reshuffle operation into the MigrateTableTransform within the data processing pipeline. The primary goal of this modification is to prevent fusion between the data reading and subsequent transformation/writing stages. By breaking this fusion, the change aims to enhance pipeline execution efficiency, promote better parallelism, and mitigate potential bottlenecks or uneven work distribution that can occur with fused operations.

Highlights

• Introduced Reshuffle Operation: A Reshuffle.viaRandomKey() operation has been added to the data processing pipeline.
• Fusion Breaking: This Reshuffle is strategically placed between the data reading and subsequent processing stages to explicitly break fusion, aiming to improve pipeline performance and stability.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 55.86%. Comparing base (d34cbde) to head (b5db735).

Files with missing lines	Patch %	Lines
...d/teleport/v2/templates/MigrateTableTransform.java	0.00%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (0.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3125      +/-   ##
============================================
+ Coverage     50.54%   55.86%   +5.31%     
+ Complexity     5047     1640    -3407     
============================================
  Files           974      471     -503     
  Lines         59808    26504   -33304     
  Branches       6523     2777    -3746     
============================================
- Hits          30230    14806   -15424     
+ Misses        27443    10801   -16642     
+ Partials       2135      897    -1238     

Components	Coverage Δ
spanner-templates	71.83% <0.00%> (+1.04%)	⬆️
spanner-import-export	∅ <ø> (∅)
spanner-live-forward-migration	80.04% <ø> (ø)
spanner-live-reverse-replication	77.73% <ø> (ø)
spanner-bulk-migration	88.24% <0.00%> (-0.02%)	⬇️

Files with missing lines	Coverage Δ
...d/teleport/v2/templates/MigrateTableTransform.java	0.00% <0.00%> (ø)

... and 521 files with indirect coverage changes

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