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Robert GruenerKorn, Uwe
aaf8d5defe2
Robert Gruener authored and Korn, Uwe committed 078b8068f1c
ARROW-2656: [Python] Improve creation time of ParquetManifest for partitioned datasets using thread pool

https://issues.apache.org/jira/browse/ARROW-2656 I probably should still write a benchmark for this, but figured I can get some quick feedback on this while working on that.

Author: Robert Gruener <robbieg@uber.com>

Closes #2185 from rgruener/thread-pooling and squashes the following commits:

4af3cdc3 <Robert Gruener> ARROW-2656:  Improve the creation time of ParquetManifest for partitioned datasets using a thread pool