David Li created ARROW-15796:
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Summary: [Python] Pickling ParquetFileFragment shouldn't fetch
metadata
Key: ARROW-15796
URL: https://issues.apache.org/jira/browse/ARROW-15796
Project: Apache Arrow
Issue Type: Improvement
Components: Python
Reporter: David Li
Follow-on to ARROW-15781/https://github.com/apache/arrow/issues/12501
Pickling a ParquetFileFragment fetches metadata; we should omit the metadata if
it's not already present, since fetching it can incur potentially expensive I/O.
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