NobiGo commented on code in PR #4016:
URL: https://github.com/apache/calcite/pull/4016#discussion_r1816537794
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core/src/main/java/org/apache/calcite/rel/rules/AggregateUnionTransposeRule.java:
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@@ -153,9 +153,31 @@ public AggregateUnionTransposeRule(Class<? extends
Aggregate> aggregateClass,
// create corresponding aggregates on top of each union child
final RelBuilder relBuilder = call.builder();
for (RelNode input : union.getInputs()) {
+ List<AggregateCall> childAggCalls = new
ArrayList<>(aggRel.getAggCallList());
+ // if the nullability of a specific input column differs from the
nullability
+ // of the union'ed column, we need to re-evaluate the nullability of the
aggregate
+ RelDataType origUnionType = union.getRowType();
Review Comment:
Maybe we can extract `union.getRowType()..getFieldList()` and
`childAggCalls` to the outside of the `for` loop. It's up to you!
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