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https://issues.apache.org/jira/browse/BEAM-1834?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15948014#comment-15948014
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Daniel Halperin commented on BEAM-1834:
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It sounds like this a feature request for BigQueryIO supporting Data-dependent
Schemas in addition to Data-dependent tables?
The latter is explicitly not supported at this time.
> Bigquery Write validation doesn't work well with ValueInSingleWindow
> --------------------------------------------------------------------
>
> Key: BEAM-1834
> URL: https://issues.apache.org/jira/browse/BEAM-1834
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-gcp
> Reporter: Kevin Peterson
> Assignee: Daniel Halperin
>
> I am using the new {{Write<T> to(SerializableFunction<ValueInSingleWindow<T>,
> String> tableSpecFunction)}} function to write data to different Bigquery
> tables depending on the values. I'm my case, the values can have a different
> schema (it starts as an {{Any}} encoded protobuf, which I parse and expand to
> a {{TableRow}} object).
> Since the tables have different schemas, the existing implementation of
> {{withSchema}} doesn't work.
> Some options:
> # Allow {{CreateDisposition.CREATE_NEVER}} in this situation. Failed inserts
> from a missing table just fail (and eventually pass through via BEAM-190).
> # Add a new {{withSchema(SerializableFunction<ValueInSingleWindow<T>,
> TableSchema>}} function.
> I think eventually both of the above should be allowable configurations, but
> just one will unblock my current error. Happy to implement, given some
> guidance on design preferences.
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