[HIVE-17623] Fix Select query Fix Double column serde and some refactoring

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0
• Fix Version/s: 3.0.0
• Component/s: Druid integration
• Assignee: Ashutosh Chauhan
• Reporter: Slim Bouguerra
• Created: 27/Sep/17 19:26
• Updated: 22/May/18 23:15
• Resolved: 28/Sep/17 22:32

Description

This PR has 2 fixes.
First, fixes the limit of results returned by Select query that used to be limited to 16K rows
Second fixes the type inference for the double type newly added to druid.
Use Jackson polymorphism to infer types and parse results from druid nodes.
Removes duplicate codes form RecordReaders.