[IGNITE-13904] Don't use rows buffers by reduce index for simple one-way reducer

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.9
• Fix Version/s: 2.10
• Component/s: sql
• Ignite Flags: Docs Required, Release Notes Required
• Assignee: Taras Ledkov
• Reporter: Taras Ledkov
• Created: 24/Dec/20 15:03
• Updated: 29/Dec/20 08:43
• Resolved: 29/Dec/20 08:43

Description

Now the reducer's index buffer AbstractReducer#fetched is used even for simple plain query. It is the cause of increased memory usage for plain query.

Proposed fix:

• don't use index buffer for simple reducer (for plain query).

Issue Links

• links to: GitHub Pull Request #8607
• links to: TCBot