liukun4515 commented on issue #2067:
URL:
https://github.com/apache/arrow-datafusion/issues/2067#issuecomment-1076968836
> Even more simple/straightforward: `coalesce(sum(x), 0)` after `coalesce`
is supported: (#1969)
I do some experiments on the spark using the `coalesce`
```
spark-sql> desc t2;
c1 int
```
spark plan:
```
spark-sql> explain select coalesce(sum(c1),0) from t2;
== Physical Plan ==
AdaptiveSparkPlan isFinalPlan=false
+- HashAggregate(keys=[], functions=[sum(c1#127)])
+- Exchange SinglePartition, ENSURE_REQUIREMENTS, [id=#252]
+- HashAggregate(keys=[], functions=[partial_sum(c1#127)])
+- Scan hive default.t2 [c1#127], HiveTableRelation
[`default`.`t2`, org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, Data Cols:
[c1#127], Partition Cols: []]
```
In my user case, the function of `sum0` will be used in the ballista size.
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