Since Apache Spark 2.2 vote passed successfully last week,
I think it’s a good time for me to ask your opinions again about the following PR.
https://github.com/apache/spark/pull/17980 (+3,887, −86)
It’s for the following issues.
Basically, the approach is trying to use the latest Apache ORC 1.4.0 officially.
You can switch between the legacy ORC data source and new ORC datasource.
Could you help me to progress this in order to improve Apache Spark 2.3?
Apache Spark always has been a fast and general engine, and
since SPARK-2883, Spark supports Apache ORC inside `sql/hive` module with Hive dependency.
With Apache ORC 1.4.0 (released yesterday), we can make Spark on ORC faster and get some benefits.
- Speed: Use both Spark `ColumnarBatch` and ORC `RowBatch` together which means full vectorization support.
- Stability: Apache ORC 1.4.0 already has many fixes and we can depend on ORC community effort in the future.
- Usability: Users can use `ORC` data sources without hive module (-Phive)
- Maintainability: Reduce the Hive dependency and eventually remove some old legacy code from `sql/hive` module.
As a first step, I made a PR adding a new ORC data source into `sql/core` module.
https://github.com/apache/spark/pull/17924 (+ 3,691 lines, -0)
Could you give some opinions on this approach?