Steven Talbot created CALCITE-3957: -------------------------------------- Summary: AggregateMergeRule should be able to merge SUM0 into COUNT even with empty group by Key: CALCITE-3957 URL: https://issues.apache.org/jira/browse/CALCITE-3957 Project: Calcite Issue Type: Bug Reporter: Steven Talbot
Basically, the comment at [https://github.com/apache/calcite/blame/571731b80a58eb095ebac7123285c375e7afff90/core/src/main/java/org/apache/calcite/rel/rules/AggregateMergeRule.java#L117-L120] does not apply if the top aggregate is a SUM0, I believe. Without a fix for this, there's this one case where this rule falls down and isn't able to merge something that just got rolled up: otherwise it's a pretty nice invariant that if one of our standard rollup rules for aggregates (say, in MaterializedViewRule) just split the aggregate, this rule should be able to merge it back. -- This message was sent by Atlassian Jira (v8.3.4#803005)