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https://issues.apache.org/jira/browse/BEAM-8236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16938124#comment-16938124
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Luke Cwik commented on BEAM-8236:
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It turns out that the dynamic table destination is the key and hence should
always have a first pane which is responsible for truncating the destination.
It should never be the case that the dynamic destination will start with a pane
index > 0
> BigQueryIO doesn't honor WRITE_TRUNCATE with DynamicDestinations after the
> first pane
> -------------------------------------------------------------------------------------
>
> Key: BEAM-8236
> URL: https://issues.apache.org/jira/browse/BEAM-8236
> Project: Beam
> Issue Type: Bug
> Components: io-java-gcp
> Reporter: Luke Cwik
> Assignee: Luke Cwik
> Priority: Major
> Fix For: Not applicable
>
>
> If the first pane does not contain elements for the dynamic destination then
> the table is not truncated. [Future writes will have a write disposition of
> append|https://github.com/apache/beam/blob/ba5c9def3967d9e3348ccf8563c2b54196fbd1ad/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigquery/WriteTables.java#L201].
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