Julian Hyde created CALCITE-4649: ------------------------------------ Summary: Add AggregateExpandGroupingSetsRule, a planner rule that removes GROUPING SETS Key: CALCITE-4649 URL: https://issues.apache.org/jira/browse/CALCITE-4649 Project: Calcite Issue Type: Bug Reporter: Julian Hyde
Add {{class AggregateExpandGroupingSetsRule}}, a planner rule that removes {{GROUPING SETS}}. Some databases do not support {{GROUPING SETS}}. (For example, BigQuery supports {{GROUP BY ROLLUP}} but not general {{GROUPING SETS}}.) But {{GROUPING SETS}} is a useful construct, increasingly used in user SQL, and also generated by rules (e.g. {{AggregateExpandWithinDistinctRule}}). The proposed rule would match an {{Aggregate}} whose {{groupSets}} field has more than one element, and would convert it to an {{Aggregate}} over a {{Join}} whose right-hand side is a list of integers, the group ids active in the query. Calls to the {{GROUP_ID}} field would be replaced by references to the group id column. -- This message was sent by Atlassian Jira (v8.3.4#803005)