Deneche A. Hakim created DRILL-4496:
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Summary: Improve ParquetGroupScan.initFromMetadataCache() to read
subfolders' cache files in parallel
Key: DRILL-4496
URL: https://issues.apache.org/jira/browse/DRILL-4496
Project: Apache Drill
Issue Type: Improvement
Components: Storage - Parquet
Affects Versions: 1.7.0
Reporter: Deneche A. Hakim
As part of fixing DRILL-4376, ParquetGroupScan. initFromMetadataCache() was
modified to read parquet metadata cache from selected subfolders.
This is done sequentially which can cause performance issues when a large
number of subfolders are selected with a wildcard.
We should improve the method to read the cache files in parallel
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