Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/18953
Hi, @cloud-fan .
In my email, I wrote in the following order .
1. SPARK-21422: Depend on Apache ORC 1.4.0
2. SPARK-20682: Add a new faster ORC data source based on Apache ORC
3. SPARK-20728: Make ORCFileFormat configurable between sql/hive and
sql/core
4. SPARK-16060: Vectorized Orc Reader
In Apache Spark 2.3, I thought we need to keep both by option
`spark.sql.orc.enabled`.
Do you mean `removing old orc data source` from `sql/hive`?
In this PR, I replaces `sql/hive` ORC to reduce the burden of review of
test code. The new test code is #17980.
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