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https://issues.apache.org/jira/browse/BEAM-10917?focusedWorklogId=633211&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-633211
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ASF GitHub Bot logged work on BEAM-10917:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 03/Aug/21 22:46
            Start Date: 03/Aug/21 22:46
    Worklog Time Spent: 10m 
      Work Description: satybald commented on pull request #15185:
URL: https://github.com/apache/beam/pull/15185#issuecomment-892214935


   > @satybald it also looks like you're using `fastavro` with the export-based 
source, which isn't implemented for the storage API source yet. Out of 
curiosity, how fast is your **v1** pipeline if you don't specify `use_fastavro` 
as an experiment?
   
   Yes, the pipeline that I am running is using `fast_avro` library with 
export-based source. However, I didn't specify `use_avro` experiment flag. The 
SDK automatically set this flag on.
   
   > how fast is your **v1** pipeline if you don't specify `use_fastavro` as an 
experiment?
   
   Sorry for confusion, I believe you mean **v3** the one with export-based 
source. To my knowledge, there's no option to turn off `fast_avro` usage as 
it's hard-coded for export based source i.e. 
[_CustomBigQuerySource](https://github.com/apache/beam/blob/master/sdks/python/apache_beam/io/gcp/bigquery.py#L765)


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Issue Time Tracking
-------------------

    Worklog Id:     (was: 633211)
    Time Spent: 10h  (was: 9h 50m)

> Implement a BigQuery bounded source using the BigQuery storage API
> ------------------------------------------------------------------
>
>                 Key: BEAM-10917
>                 URL: https://issues.apache.org/jira/browse/BEAM-10917
>             Project: Beam
>          Issue Type: New Feature
>          Components: io-py-gcp
>            Reporter: Kenneth Jung
>            Assignee: Kanthi Subramanian
>            Priority: P3
>          Time Spent: 10h
>  Remaining Estimate: 0h
>
> The Java SDK contains a bounded source implementation which uses the BigQuery 
> storage API to read from BigQuery. We should implement the same for Python.



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