Allow BigQuery TableIds to have space in between

[dgdheeraj]

For Issue #21878
io.Bigquery rejects valid tableIds if they contain spaces.:

However these are allowed by the BigQuery API:
https://cloud.google.com/bigquery/docs/tables#table_naming

If tableId includes hyphens, causes this error

ValueError: Expected a table reference (PROJECT:DATASET.TABLE or DATASET.TABLE) instead of project.dataset.table-id

FIX:
The regex is modified to allow spaces only in between the word and not allow trailing/leading spaces

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It's my first attempt contributing to beam.
Please do let me know if there are any further changes/issues with the PR
@pabloem
@kennknowles
@robertwb

[codecov]

Codecov Report

Merging #22167 (930ad5e) into master (b53b16f) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #22167      +/-   ##
==========================================
- Coverage   74.22%   74.20%   -0.02%     
==========================================
  Files         702      702              
  Lines       92829    92830       +1     
==========================================
- Hits        68904    68887      -17     
- Misses      22658    22676      +18     
  Partials     1267     1267              

Flag	Coverage Δ
python	83.59% <100.00%> (-0.03%)	⬇️

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

Impacted Files	Coverage Δ
sdks/python/apache_beam/io/gcp/bigquery.py	70.07% <ø> (ø)
sdks/python/apache_beam/io/gcp/bigquery_tools.py	85.67% <100.00%> (+0.01%)	⬆️
.../python/apache_beam/testing/test_stream_service.py	88.09% <0.00%> (-4.77%)	⬇️
sdks/python/apache_beam/utils/interactive_utils.py	95.12% <0.00%> (-2.44%)	⬇️
sdks/python/apache_beam/io/source_test_utils.py	88.01% <0.00%> (-1.39%)	⬇️
...che_beam/runners/interactive/interactive_runner.py	90.06% <0.00%> (-1.33%)	⬇️
sdks/python/apache_beam/io/localfilesystem.py	90.97% <0.00%> (-0.76%)	⬇️
...eam/runners/portability/fn_api_runner/execution.py	92.44% <0.00%> (-0.65%)	⬇️
sdks/python/apache_beam/runners/direct/executor.py	96.46% <0.00%> (-0.55%)	⬇️
...ks/python/apache_beam/runners/worker/sdk_worker.py	88.94% <0.00%> (-0.16%)	⬇️
... and 2 more

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[robertwb]

Thanks, this looks good.

Technically \s is broader than Zs, but I don't see a good way to make that distinction with Python's re module, and false positives here are preferable to false negatives.

[dgdheeraj]

Thanks, this looks good.

Technically \s is broader than Zs, but I don't see a good way to make that distinction with Python's re module, and false positives here are preferable to false negatives.

Thanks for the review!
Yeah, I couldn't find up with a better way to include Zs apart from \s

[tvalentyn]

Thanks, @dgdheeraj !