julianhyde commented on a change in pull request #2458:
URL: https://github.com/apache/calcite/pull/2458#discussion_r675922400
##########
File path:
core/src/main/java/org/apache/calcite/rel/rel2sql/RelToSqlConverter.java
##########
@@ -504,12 +518,16 @@ protected Builder buildAggregate(Aggregate e, Builder
builder,
SqlStdOperatorTable.ROLLUP.createCall(SqlParserPos.ZERO, groupKeys));
default:
case OTHER:
+ List<SqlNode> groupingSetsList = aggregate.getGroupSets().stream()
+ .map(groupSet -> groupItem(groupKeys, groupSet,
aggregate.getGroupSet()))
+ .collect(Collectors.toList());
+ if (ImmutableBitSet.union(aggregate.getGroupSets()).cardinality()
+ != aggregate.getGroupSet().cardinality()) {
Review comment:
Or, even better,
`!ImmutableBitSet.union(aggregate.getGroupSets()).equals(aggregate.getGroupSet())`.
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