[SPARK-26909] use unsafeRow.hashCode() as hash value in HashAggregate

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.0
• Fix Version/s: 3.0.0
• Component/s: SQL
• Assignee: yucai
• Reporter: yucai
• Created: 18/Feb/19 08:00
• Updated: 19/Feb/19 05:11
• Resolved: 19/Feb/19 05:11

Description

This is a followup PR for #21149.

New way uses unsafeRow.hashCode() as hash value in HashAggregate.
The unsafe row has [null bit set] etc., the result should be different, so we don't need weird `48`.

Issue Links

• links to: GitHub Pull Request #23821