[IGNITE-13543] Calcite integration. Sort-based aggregates

• Type: New Feature
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Component/s: sql
• Ignite Flags: Docs Required, Release Notes Required
• Assignee: Taras Ledkov
• Reporter: Iurii Gerzhedovich
• Created: 07/Oct/20 09:20
• Updated: 04/Mar/21 12:52
• Resolved: 04/Mar/21 10:21

Description

To have a performance boost need to implement merge aggregates.
The merge aggregate is applied for sorted input of the aggregate.
In this case only one aggregation group is stored at the memory.

Also the input of the aggregate may be sorted by force.

Issue Links

• is part of: IGNITE-12248 Apache Calcite based query execution engine
• links to: GitHub Pull Request #8683