[HIVE-5663] Refactor ORC RecordReader to operate on direct & wrapped ByteBuffers

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.13.0
• Fix Version/s: 0.13.0
• Component/s: File Formats
• Labels: ORC

Environment

Ubuntu LXC

• Release Note: Refactor ORC RecordReader to use ByteBuffer APIs instead of relying on underlying array()
• Assignee: Gopal Vijayaraghavan
• Reporter: Gopal Vijayaraghavan
• Created: 27/Oct/13 20:22
• Updated: 20/Nov/13 21:06
• Resolved: 20/Nov/13 21:06

Description

The current ORC RecordReader implementation assumes array structures backing the ByteBuffers it passes around between RecordReaderImpl and Compressed/Uncompressed InStream objects.

This patch attempts to refactor those assumptions out of both classes, allowing the future use of direct byte buffers within ORC (as might come from HDFS zero-copy readers).