AddFiles: extract bounded async task plumbing and Parquet footer reads - #39896
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ConvertToDataFile ran its per-file work (footer read, metrics, partition resolution) on a private thread pool. This change moves that queue into BoundedAsyncTasks and the footer read into ParquetFooters so the upcoming schema pre-pass (a second DoFn that reads every Parquet footer) can share both instead of copying them.
chamikaramj
requested changes
Aug 27, 2026
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ConvertToDataFile ran its per-file work (footer read, metrics, partition
resolution) on a private thread pool.
This change moves that queue into BoundedAsyncTasks and the footer read
into ParquetFooters so the upcoming schema pre-pass (a second DoFn that
reads every Parquet footer) can share both instead of copying them.
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