perf: optimize inspect.partitions
#2359
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Parallelizes manifest processing to improve performance for large tables with many manifest files. After parallel processing, merges the resulting partition maps to produce the final aggregated result.
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Hey @jayceslesar could you please take a look on this PR? Thank you. I took this PR as ref and wanted to apply to |
Fokko
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Aug 20, 2025
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Hey @emilie-wang Thanks for speeding this up. While at it, I think we need to do a minor refactor as well to keep everything readable.
pyiceberg/table/inspect.py
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| partitions_map: Dict[Tuple[str, Any], Any] = {} | ||
| snapshot = self._get_snapshot(snapshot_id) | ||
| for manifest in snapshot.manifests(self.tbl.io): | ||
| def process_manifest(manifest: ManifestFile) -> Dict[Tuple[str, Any], Any]: |
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Since we're at it, I would suggest two things:
- Move the inline function to the class level, and add an underscore to the name, to indicate that it is considered private
_process_manifest. - Merge this function with
update_partitions_map, since that function isn't used anywhere else.
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Hi @Fokko, thank you for the review and updated with the code refactoring.
Fokko
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Aug 20, 2025
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Aug 20, 2025
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Thanks for fixing this @emilie-wang 🙌 |
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Parallelizes manifest processing to improve performance for large tables with many manifest files. After parallel processing, merges the resulting partition maps to produce the final aggregated result.
Previous example ref: e937f6a
Rationale for this change
Perf improvement.
We experienced slowness with table.inspect.partitions() with large table.
Are these changes tested?
Yes.
Are there any user-facing changes?
No.