rok commented on code in PR #16738:
URL: https://github.com/apache/datafusion/pull/16738#discussion_r2267500445
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datafusion/datasource-parquet/src/file_format.rs:
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@@ -1749,16 +1732,16 @@ fn spawn_parquet_parallel_serialization_task(
// Do not surface error from closed channel (means
something
// else hit an error, and the plan is shutting down).
Review Comment:
Line 1726 currently seems to cause a deadlock the second time it's hit in
`write_parquet_with_small_rg_size` test. I imagine a thread won't release
column writers while another is trying to use them looping forever or some
version of that. I'm still trying to understand what exactly happens.
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