[PHOENIX-2282] Define serialization of sub scan for Drill to leverage Phoenix

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Labels: drill
• Assignee: Jacques Nadeau
• Reporter: James R. Taylor
• Created: 21/Sep/15 18:28
• Updated: 01/Oct/15 18:47
• Resolved: 01/Oct/15 18:47

Description

I think there are two pieces:

• the separate parallel unit (always a Scan for Phoenix)
• the reader class to instantiate that will interpret the results.

It be pretty easy to write code that combines multiple Scans together too, based on the start row/end row in the case that Phoenix over-parallelizes due to guideposts.

FWIW, even the Phoenix DML (UPSERT SELECT and DELETE) fit this model of a Scan plus the reader code which would push the data back out for the writes (see UpsertCompiler and DeleteCompiler).