andygrove opened a new issue, #817:
URL: https://github.com/apache/datafusion-comet/issues/817
### Describe the bug
I was attempting to run a microbenchmark with this sql extracted from TPC-DS
q39:
```sql
select w_warehouse_name,w_warehouse_sk,i_item_sk,d_moy
,stddev_samp(inv_quantity_on_hand) stdev,avg(inv_quantity_on_hand) mean
from inventory
,item
,warehouse
,date_dim
where inv_item_sk = i_item_sk
and inv_warehouse_sk = w_warehouse_sk
and inv_date_sk = d_date_sk
and d_year =2001
group by w_warehouse_name,w_warehouse_sk,i_item_sk,d_moy;
```
I ran against sf=100 data and this caused a panic:
```
An exception occurred while executing the Java class. Job aborted due to
stage failure: Task 8 in stage 111.0 failed 1 times, most recent failure: Lost
task 8.0 in stage 111.0 (TID 740) (10.0.0.118 executor driver):
org.apache.comet.CometNativeException: EmitTo::First is not supported
[ERROR] at comet::errors::init::{{closure}}(__internal__:0)
[ERROR] at std::panicking::rust_panic_with_hook(__internal__:0)
[ERROR] at
std::panicking::begin_panic_handler::{{closure}}(__internal__:0)
[ERROR] at
std::sys_common::backtrace::__rust_end_short_backtrace(__internal__:0)
[ERROR] at rust_begin_unwind(__internal__:0)
[ERROR] at core::panicking::panic_fmt(__internal__:0)
[ERROR] at
<comet::execution::datafusion::expressions::avg::AvgGroupsAccumulator<T,F> as
datafusion_expr::groups_accumulator::GroupsAccumulator>::state(__internal__:0)
[ERROR] at
datafusion_physical_plan::aggregates::row_hash::GroupedHashAggregateStream::emit(__internal__:0)
[ERROR] at
<datafusion_physical_plan::aggregates::row_hash::GroupedHashAggregateStream as
futures_core::stream::Stream>::poll_next(__internal__:0)
```
### Steps to reproduce
_No response_
### Expected behavior
_No response_
### Additional context
_No response_
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