Ted-Jiang opened a new issue, #2180:
URL: https://github.com/apache/arrow-datafusion/issues/2180
**Is your feature request related to a problem or challenge? Please describe
what you are trying to do.**
in `datafusion.proto`
```
message AggregateExprNode {
AggregateFunction aggr_function = 1;
repeated LogicalExprNode expr = 2;
}
```
in `ballista.proto`
```
message PhysicalAggregateExprNode {
datafusion.AggregateFunction aggr_function = 1;
PhysicalExprNode expr = 2;
}
```
it will make below query fail in serilize at executor. beacust
`approx_percentile_cont` AggregateExp has two args.
```
select approx_percentile_cont("o_totalprice", 0.5) from orders;
```
**Describe the solution you'd like**
Make
```
repeated PhysicalExprNode expr = 2;
```
**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features
you've considered.
**Additional context**
Add any other context or screenshots about the feature request here.
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