lukecwik commented on a change in pull request #11103: [BEAM-9494] Reifying
outputs from BQ file writing
URL: https://github.com/apache/beam/pull/11103#discussion_r391837106
##########
File path: sdks/python/apache_beam/io/gcp/bigquery_file_loads.py
##########
@@ -739,9 +739,12 @@ def _write_files(self, destination_data_kv_pc,
file_prefix_pcv):
file_prefix_pcv,
*self.schema_side_inputs))
+ # We flatten both PCollection paths, and reify. We do this due to some
+ # trickiness with coder-setting on Flatten-GBK boundaries.
all_destination_file_pairs_pc = (
(destination_files_kv_pc, more_destination_files_kv_pc)
Review comment:
```suggestion
# TODO(BEAM-9494): Remove the identity transform. We flatten both
PCollection paths
# and use an identity function to work around a flatten optimization
issue where the wrong
# coder is being used.
all_destination_file_pairs_pc = (
(destination_files_kv_pc, more_destination_files_kv_pc)
```
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