test(workflow-operator): add unit tests for SklearnModelOpDesc

[Ma77Ball]

What changes were proposed in this PR?

• Add SklearnModelOpDescSpec using a minimal concrete subclass of the abstract descriptor.
• Verify the countVectorizer and tfidfTransformer flags default to false.
• Verify getOutputSchemas keys the single output by the output port id and produces exactly model_name STRING and model BINARY, independent of input schemas.

Any related issues, documentation, discussions?

Closes: #6664

How was this PR tested?

• Run: sbt "WorkflowOperator/testOnly *SklearnModelOpDescSpec", expect all 4 tests passing.
• Test-only change; no production code is modified.

Was this PR authored or co-authored using generative AI tooling?

Co-authored with Claude Opus 4.8 in compliance with ASF

[github-actions]

Automated Reviewer Suggestions

Based on the git blame history of the changed files, we recommend the following reviewers:

• No candidates found from git blame history.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.65%. Comparing base (0467c76) to head (69d5d05).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #6665   +/-   ##
=========================================
  Coverage     74.65%   74.65%           
  Complexity     3438     3438           
=========================================
  Files          1160     1160           
  Lines         45793    45793           
  Branches       5069     5069           
=========================================
  Hits          34189    34189           
  Misses         9953     9953           
  Partials       1651     1651           

Flag	Coverage Δ		*Carryforward flag
access-control-service	70.00% <ø> (ø)
agent-service	76.76% <ø> (ø)		Carriedforward from 0467c76
amber	66.81% <ø> (ø)
computing-unit-managing-service	18.00% <ø> (ø)
config-service	66.66% <ø> (ø)
file-service	66.80% <ø> (ø)
frontend	78.56% <ø> (ø)		Carriedforward from 0467c76
notebook-migration-service	78.94% <ø> (ø)
pyamber	91.99% <ø> (ø)		Carriedforward from 0467c76
workflow-compiling-service	55.14% <ø> (ø)

*This pull request uses carry forward flags. Click here to find out more.

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[github-actions]

⚠️ Benchmark changes need a look

🟢 0 better · 🔴 8 worse · ⚪ 7 noise (<±5%) · 0 without baseline

Compared against main 0467c76 benchmarked on this same runner, so the delta is largely free of cross-runner hardware noise. The "7d avg" column still reflects the gh-pages dashboard. Treat <±5% as noise unless repeated.

Dashboard · Run

	config	throughput	MB/s	latency	max Δ latest / 7d
🔴	bs=10 sw=10 sl=64	443	0.271	21,919/28,549/28,549 us	🔴 +15.5% / 🔴 +82.6%
🔴	bs=100 sw=10 sl=64	921	0.562	105,795/157,352/157,352 us	🔴 +23.2% / 🔴 +48.5%
⚪	bs=1000 sw=10 sl=64	1,090	0.665	917,304/948,914/948,914 us	⚪ within ±5% / 🟢 -9.5%

Baseline details

Latest main 0467c76 from same runner

config	metric	PR	latest main	7d avg	Δ latest	Δ 7d
bs=10 sw=10 sl=64	throughput	443 tuples/sec	492 tuples/sec	767.23 tuples/sec	-10.0%	-42.3%
bs=10 sw=10 sl=64	MB/s	0.271 MB/s	0.301 MB/s	0.468 MB/s	-10.0%	-42.1%
bs=10 sw=10 sl=64	p50	21,919 us	18,977 us	12,705 us	+15.5%	+72.5%
bs=10 sw=10 sl=64	p95	28,549 us	29,918 us	15,633 us	-4.6%	+82.6%
bs=10 sw=10 sl=64	p99	28,549 us	29,918 us	20,214 us	-4.6%	+41.2%
bs=100 sw=10 sl=64	throughput	921 tuples/sec	974 tuples/sec	1,001 tuples/sec	-5.4%	-8.0%
bs=100 sw=10 sl=64	MB/s	0.562 MB/s	0.595 MB/s	0.611 MB/s	-5.5%	-8.0%
bs=100 sw=10 sl=64	p50	105,795 us	99,844 us	99,949 us	+6.0%	+5.8%
bs=100 sw=10 sl=64	p95	157,352 us	127,727 us	105,996 us	+23.2%	+48.5%
bs=100 sw=10 sl=64	p99	157,352 us	127,727 us	117,999 us	+23.2%	+33.4%
bs=1000 sw=10 sl=64	throughput	1,090 tuples/sec	1,104 tuples/sec	1,033 tuples/sec	-1.3%	+5.5%
bs=1000 sw=10 sl=64	MB/s	0.665 MB/s	0.674 MB/s	0.631 MB/s	-1.3%	+5.5%
bs=1000 sw=10 sl=64	p50	917,304 us	911,050 us	974,571 us	+0.7%	-5.9%
bs=1000 sw=10 sl=64	p95	948,914 us	944,008 us	1,016,467 us	+0.5%	-6.6%
bs=1000 sw=10 sl=64	p99	948,914 us	944,008 us	1,048,798 us	+0.5%	-9.5%

Raw CSV

config_idx,batch_size,schema_width,string_len,num_batches,total_ms,total_tuples,total_bytes,tuples_per_sec,mb_per_sec,lat_p50_us,lat_p95_us,lat_p99_us
0,10,10,64,20,451.13,200,128000,443,0.271,21919.05,28549.22,28549.22
1,100,10,64,20,2172.26,2000,1280000,921,0.562,105795.00,157352.09,157352.09
2,1000,10,64,20,18349.09,20000,12800000,1090,0.665,917304.47,948913.67,948913.67

[Copilot]

Pull request overview

Adds ScalaTest unit coverage for SklearnModelOpDesc (a shared abstract sklearn operator descriptor in common/workflow-operator) to lock in its default flag values and its fixed output-schema contract, as requested in #6664.

Changes:

• Introduces SklearnModelOpDescSpec with a minimal concrete subclass to instantiate the abstract descriptor.
• Asserts countVectorizer and tfidfTransformer default to false.
• Verifies getOutputSchemas always returns exactly one output keyed by the output port id, with model_name: STRING and model: BINARY, independent of input schemas.

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[aglinxinyuan]

LGTM!