Luke Cwik created BEAM-8236:
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             Summary: 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


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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