jinxing64 commented on a change in pull request #1606: [CALCITE-3466] Do not
drop the "group by" clause of subquery in a select statement with "group by"
clause in JDBC adapter.
URL: https://github.com/apache/calcite/pull/1606#discussion_r364800580
##########
File path:
core/src/main/java/org/apache/calcite/rel/rel2sql/SqlImplementor.java
##########
@@ -1224,10 +1224,18 @@ public Builder builder(RelNode rel, Clause... clauses)
{
needNew = true;
}
}
- if (rel instanceof Aggregate
- && !dialect.supportsNestedAggregations()
- && hasNestedAggregations((Aggregate) rel)) {
- needNew = true;
+
+ if (rel instanceof Aggregate) {
+ Aggregate e = (Aggregate) rel;
+ final boolean nestedAgg = hasNestedAggregations(e);
+ if (withGroupBy() && (!e.getGroupSet().toList().isEmpty()
+ || !nestedAgg || !dialect.supportsNestedAggregations())) {
Review comment:
Shall we have a method as below:
```
// Indicate that whether nested aggregation can be applied.
public boolean canApplyNestedAggregation(Aggregate agg) {
return agg.getGroupCount() == 0
&& hasNestedAggregations(agg)
&& dialect.supportsNestedAggregations();
}
```
So the change here will be much simpler that
```
...
if (rel instanceof Aggregate
&& this.clauses.contains(Clause.GROUP_BY)
&& !canApplyNestedAggregation((Aggregate) rel)) {
needNew = true;
}
...
```
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