[CALCITE-3590] Support SQL hints for Aggregate

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.21.0
• Fix Version/s: 1.22.0
• Component/s: core
• Labels: pull-request-available
• Assignee: Shuo Cheng
• Reporter: Shuo Cheng
• Created: 11/Dec/19 15:04
• Updated: 06/Mar/20 04:35
• Resolved: 18/Dec/19 03:14

Description

Currently in CALCITE-482, hints are only supported for Project, Join and TableScan. It's also necessary to support hints for Aggregate so as to enable fine grained Aggregate configuration, e.g., two-stage-aggregation.

SELECT /*+ TWO_STAGE_AGG(true) */
dep_id,
grade,
avg(annual_salary),
min(annual_salary),
max(annual_salary)
FROM T
GROUP BY dep_id, grade;

Issue Links

• relates to: CALCITE-3594 Support hot Groupby keys hint
• links to: GitHub Pull Request #1669