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From Tomer Shiran <tshi...@dremio.com>
Subject Parquet read optimization
Date Thu, 15 Oct 2015 06:16:46 GMT
Why is the Parquet read optimization not on by default?

Optimizing Reads of Parquet-Backed Tables

Use the store.hive.optimize_scan_with_native_readers option to optimize
reads of Parquet-backed external tables from Hive. When set to TRUE, this
option uses Drill native readers instead of the Hive Serde interface,
resulting in more performant queries of Parquet-backed external tables.
(Drill 1.2 and later)

Set the store.hive.optimize_scan_with_native_readers option as described in
the section, "Planning and Execution Options"
<http://kristinehahn.github.io/drill/docs/planning-and-execution-options/>.

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