[CALCITE-6332] Optimization CoreRules.AGGREGATE_EXPAND_DISTINCT_AGGREGATES_TO_JOIN produces incorrect results for aggregates with groupSets

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.36.0
• Fix Version/s: 1.37.0
• Component/s: core
• Labels: pull-request-available
• Assignee: Mihai Budiu
• Reporter: Mihai Budiu
• Created: 15/Mar/24 02:41
• Updated: 09/Apr/24 15:28
• Resolved: 09/Apr/24 15:28

Description

The optimization rule does not seem to consider the groupSets at all.
The following two queries produce the same resulting plan:

select count(distinct deptno) as cd, count(*) as c
from emp
group by cube(deptno)

select count(distinct deptno) as cd, count(*) as c
from emp
group by deptno

(Notice that one query has a cube, while the other one doesn't)
The produced plan is:

    LogicalProject(CD=[$1], C=[$2]), id = 196
      LogicalAggregate(group=[{0}], CD=[COUNT($0)], C=[$SUM0($1)]), id = 201
        LogicalAggregate(group=[{0}], C=[COUNT()]), id = 198
          LogicalProject(DEPTNO=[$8]), id = 192
            LogicalTableScan(table=[[schema, EMP]]), id = 163

Issue Links

• is related to: CALCITE-732 Implement multiple distinct-COUNT using GROUPING SETS
• relates to: CALCITE-6335 Quidem tests should allow specifying optimization passes to apply to programs
• links to: GitHub Pull Request #3749