[HUDI-7570] Update RFC with details on API changes

• Type: Task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.0.0-beta2, 1.0.0
• Labels: hudi-1.0.0-beta2
• Story Points: 2
• Epic Link: secondary index
• Assignee: Sagar Sumit
• Reporter: Sagar Sumit

Reviewers

Vinoth Chandar

• Created: 02/Apr/24 16:00
• Updated: 10/Jun/24 17:56
• Resolved: 21/May/24 01:55

Description

Given that secondary index can have duplicate keys, the existing 
`HoodieMergedLogRecordScanner` is insufficient to handle duplicates because it depends on `ExternalSpillableMap` which can only hold unique keys. RFC should clarify how the merged log record scanner will change. We should not be leaking any details to merge handle.