Fix failing BQ file loads test for Py37

[ahmedabu98]

Fixes #23264

[ahmedabu98]

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[ahmedabu98]

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[codecov[bot]]

Codecov Report

Merging #23283 (e543e52) into master (9287b92) will decrease coverage by 0.00%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #23283      +/-   ##
==========================================
- Coverage   73.45%   73.45%   -0.01%     
==========================================
  Files         718      718              
  Lines       95526    95528       +2     
==========================================
+ Hits        70170    70171       +1     
- Misses      24060    24061       +1     
  Partials     1296     1296              

Flag	Coverage Δ
python	83.18% <ø> (-0.01%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
sdks/python/apache_beam/io/source_test_utils.py	88.01% <0.00%> (-1.39%)	:arrow_down:
sdks/python/apache_beam/internal/metrics/metric.py	93.00% <0.00%> (-1.00%)	:arrow_down:
...thon/apache_beam/ml/inference/sklearn_inference.py	95.45% <0.00%> (-0.33%)	:arrow_down:
...ks/python/apache_beam/runners/worker/sdk_worker.py	88.94% <0.00%> (-0.16%)	:arrow_down:
...thon/apache_beam/ml/inference/pytorch_inference.py	0.00% <0.00%> (ø)
...hon/apache_beam/ml/inference/tensorrt_inference.py	0.00% <0.00%> (ø)
sdks/python/apache_beam/ml/inference/base.py	95.83% <0.00%> (+0.18%)	:arrow_up:
sdks/python/apache_beam/runners/direct/executor.py	97.01% <0.00%> (+0.54%)	:arrow_up:
sdks/python/apache_beam/utils/interactive_utils.py	97.56% <0.00%> (+2.43%)	:arrow_up:

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[ahmedabu98]

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[ahmedabu98]

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[ryanthompson591]

This looks fine, but I don't really understand how this fixes the issue. Can you explain that in the comments of the test?

It's not really clear why we would instantiate the pipeline once with the class instead of for each test.