Aman Sinha created DRILL-4287:
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Summary: Do lazy reading of parquet metadata cache file
Key: DRILL-4287
URL: https://issues.apache.org/jira/browse/DRILL-4287
Project: Apache Drill
Issue Type: Bug
Components: Query Planning & Optimization
Affects Versions: 1.4.0
Reporter: Aman Sinha
Assignee: Aman Sinha
Currently, the parquet metadata cache file is read eagerly during creation of
the DrillTable (as part of ParquetFormatMatcher.isReadable()). This is not
desirable from performance standpoint since there are scenarios where we want
to do some up-front optimizations - e.g. directory-based partition pruning (see
DRILL-2517) or potential limit 0 optimization etc. - and in such situations it
is better to do lazy reading of the metadata cache file.
This is a placeholder to perform such delayed reading since it is needed for
the aforementioned optimizations.
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