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Update Documentation of BigQuery source/sink to include the exact format of data read/written

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
62/100
Issue type
Documentation
Clarity
Clearly specified
Activity status
Stale
Tech stack
google-cloud, python
Domain
documentation

Research direction

Start with the documentation near the BigQuery source/sink definitions in sdks/python/apache_beam/io/gcp/bigquery.py, especially the section linked in the issue. Inspect the surrounding source and sink behavior to determine the dictionary formats and add representative examples. Done means the documentation clearly shows the exact data read and written by both components.

Written by the indexing model from the issue text.

Description

core improvement P3 python

Currently documentation at following location simply mentions that BigQuery source/sink reads/writes dictionaries. This documentation should be updated to include examples.

https://github.com/apache/beam/blob/master/sdks/python/apache_beam/io/gcp/bigquery.py#L22

Imported from Jira BEAM-3090. Original Jira may contain additional context.
Reported by: chamikara.

Dominant language
Java
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Merged PRs (30d)
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