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https://issues.apache.org/jira/browse/BEAM-10389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17291793#comment-17291793
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Beam JIRA Bot commented on BEAM-10389:
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This issue is assigned but has not received an update in 30 days so it has been
labeled "stale-assigned". If you are still working on the issue, please give an
update and remove the label. If you are no longer working on the issue, please
unassign so someone else may work on it. In 7 days the issue will be
automatically unassigned.
> SqlTransform only allows one registered RowCoder schema
> -------------------------------------------------------
>
> Key: BEAM-10389
> URL: https://issues.apache.org/jira/browse/BEAM-10389
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Reporter: Maximilian Michels
> Assignee: Brian Hulette
> Priority: P3
> Labels: stale-assigned
>
> The current workflow for using the SqlTransform is:
> {code:python}
> Row = typing.NamedTuple("Row", [("col1", int), ("col2", str)])
> beam.coders.registry.register_coder(Row, beam.coders.RowCoder)
> with self.create_pipeline() as p:
> output = (
> p
> | 'Create' >> beam.Create([Row(x, str(x)) for x in range(5)])
> | 'Sql' >> SqlTransform(
> """SELECT col1, col2 || '*' || col2 as col2,
> power(col1, 2) as col3
> FROM PCOLLECTION))
> {code}
> This works fine, but when multiple row schemas are registered like this:
> {code:python}
> Row = typing.NamedTuple("Row", [("col1", int), ("col2", str)])
> beam.coders.registry.register_coder(Row, beam.coders.RowCoder)
> with self.create_pipeline() as p:
> output = (
> p
> | 'Create' >> beam.Create([Row(x, str(x)) for x in range(5)])
> | 'Sql' >> SqlTransform(
> """SELECT col1, col2 || '*' || col2 as col2,
> power(col1, 2) as col3
> FROM PCOLLECTION))
> output2 = (
> p
> | 'Create2' >> beam.Create([Row2(x, str(x)) for x in range(5)])
> | 'Sql2' >> SqlTransform(
> """SELECT col1, col2 || '*' || col2 as col2,
> power(col1, 2) as col3
> FROM PCOLLECTION
> """))
> {code}
> This yields:
> {noformat}
> RuntimeError: Re-used coder id: ref_Coder_RowCoder_1
> {noformat}
> Source:
> https://github.com/apache/beam/blob/a8f390704925d3a371b007ccbfcfc28a48b312d1/sdks/python/apache_beam/transforms/external.py#L419
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