Rendy Bambang Junior created BEAM-5352:
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Summary: BigQuery IO Source is not Exporting to GCS as written in
documentation
Key: BEAM-5352
URL: https://issues.apache.org/jira/browse/BEAM-5352
Project: Beam
Issue Type: Bug
Components: sdk-py-core
Affects Versions: 2.6.0
Reporter: Rendy Bambang Junior
Assignee: Ahmet Altay
Did some check on the beam code and find out that DataFlow is querying BigQuery
and retrieve the result using pagination [1]. As per our understanding, this
means no parallelism on reading BigQuery table. It is contradictory to what the
documentation is telling us [2].
Is this some kind of work in progress? I'm filing as a bug since documentation
telling me that it is using GCS meanwhile it's using NativeSourceReader which
yield data per row as iterator.
[1]
[https://github.com/apache/beam/blob/520b3a24e49306c30940ceab09100d775a04d28e/sdks/python/apache_beam/io/gcp/bigquery.py#L1083]
[2]
[https://github.com/apache/beam/blob/520b3a24e49306c30940ceab09100d775a04d28e/sdks/python/apache_beam/io/gcp/bigquery.py#L60]
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