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https://issues.apache.org/jira/browse/BEAM-1440?focusedWorklogId=352622&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-352622
]
ASF GitHub Bot logged work on BEAM-1440:
----------------------------------------
Author: ASF GitHub Bot
Created on: 03/Dec/19 13:49
Start Date: 03/Dec/19 13:49
Worklog Time Spent: 10m
Work Description: kamilwu commented on pull request #9772: [BEAM-1440]
Create a BigQuery source that implements iobase.BoundedSource for Python
URL: https://github.com/apache/beam/pull/9772#discussion_r353187727
##########
File path: sdks/python/apache_beam/io/gcp/bigquery.py
##########
@@ -1268,3 +1461,140 @@ def display_data(self):
tableSpec)
res['table'] = DisplayDataItem(tableSpec, label='Table')
return res
+
+
+@experimental()
+class PassThroughThenCleanup(PTransform):
+ """A PTransform that invokes a DoFn after the input PCollection has been
+ processed.
+ """
+ def __init__(self, cleanup_dofn):
+ self.cleanup_dofn = cleanup_dofn
+
+ def expand(self, input):
+ class PassThrough(beam.DoFn):
+ def process(self, element):
+ yield element
+
+ output = input | beam.ParDo(PassThrough()).with_outputs('cleanup_signal',
+ main='main')
+ main_output = output['main']
+ cleanup_signal = output['cleanup_signal']
+
+ _ = (input.pipeline
+ | beam.Create([None])
+ | beam.ParDo(self.cleanup_dofn, beam.pvalue.AsSingleton(
+ cleanup_signal)))
+
+ return main_output
+
+
+@experimental()
+class ReadFromBigQuery(PTransform):
Review comment:
I'm totally fine with it.
Once this PR is merged, I'm going to make changes to the Chicago Taxi
Example, so that the example would use this transform. That would be a great
opportunity to check stability and measure performance of the transform
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Issue Time Tracking
-------------------
Worklog Id: (was: 352622)
Time Spent: 11h 40m (was: 11.5h)
> Create a BigQuery source (that implements iobase.BoundedSource) for Python SDK
> ------------------------------------------------------------------------------
>
> Key: BEAM-1440
> URL: https://issues.apache.org/jira/browse/BEAM-1440
> Project: Beam
> Issue Type: New Feature
> Components: sdk-py-core
> Reporter: Chamikara Madhusanka Jayalath
> Assignee: Kamil Wasilewski
> Priority: Major
> Time Spent: 11h 40m
> Remaining Estimate: 0h
>
> Currently we have a BigQuery native source for Python SDK [1].
> This can only be used by Dataflow runner.
> We should implement a Beam BigQuery source that implements
> iobase.BoundedSource [2] interface so that other runners that try to use
> Python SDK can read from BigQuery as well. Java SDK already has a Beam
> BigQuery source [3].
> [1]
> https://github.com/apache/beam/blob/master/sdks/python/apache_beam/io/gcp/bigquery.py
> [2]
> https://github.com/apache/beam/blob/master/sdks/python/apache_beam/io/iobase.py#L70
> [3]
> https://github.com/apache/beam/blob/master/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigquery/BigQueryIO.java#L1189
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