arkanovicz commented on code in PR #4115:
URL: https://github.com/apache/calcite/pull/4115#discussion_r1899316591
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core/src/main/java/org/apache/calcite/rel/metadata/RelMdUtil.java:
##########
@@ -568,15 +568,15 @@ public static void setAggChildKeys(
ImmutableBitSet groupKey,
Aggregate aggRel,
ImmutableBitSet.Builder childKey) {
- List<AggregateCall> aggCalls = aggRel.getAggCallList();
+ final List<AggregateCall> aggCallList = aggRel.getAggCallList();
+ final List<Integer> groupList = aggRel.getGroupSet().asList();
for (int bit : groupKey) {
if (bit < aggRel.getGroupCount()) {
// group by column
- childKey.set(bit);
+ childKey.set(groupList.get(bit));
Review Comment:
Why is the conversion to list needed? Why not:
```
for (int i: rel.getGroupSet())
```
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