UBarney commented on issue #15734:
URL: https://github.com/apache/datafusion/issues/15734#issuecomment-2865471512
maybe it generate bad plan ? `AggregateExec.gby` should not be empty
```
> explain analyze select 'wat' as key, count(1) as count from (select * from
unnest(array[]::text[])) as b(field) group by key;
+-------------------+----------------------------------------------------------------------------------------------------------------------------------------------------+
| plan_type | plan
|
+-------------------+----------------------------------------------------------------------------------------------------------------------------------------------------+
| Plan with Metrics | ProjectionExec: expr=[wat as key, count(Int64(1))@0 as
count], metrics=[output_rows=1, elapsed_compute=1.112µs]
|
| | AggregateExec: mode=Final, gby=[],
aggr=[count(Int64(1))], metrics=[output_rows=1, elapsed_compute=4.163µs]
|
| | CoalescePartitionsExec, metrics=[output_rows=24,
elapsed_compute=10.677µs]
|
| | AggregateExec: mode=Partial, gby=[],
aggr=[count(Int64(1))], metrics=[output_rows=24, elapsed_compute=4.377µs]
|
| | RepartitionExec:
partitioning=RoundRobinBatch(24), input_partitions=1,
metrics=[fetch_time=18.502µs, repartition_time=1ns, send_time=24ns] |
| | ProjectionExec: expr=[],
metrics=[output_rows=0, elapsed_compute=1ns]
|
| | UnnestExec, metrics=[output_rows=0,
elapsed_compute=12.387µs, input_batches=1, input_rows=1, output_batches=0]
|
| | ProjectionExec: expr=[[] as
__unnest_placeholder(make_array())], metrics=[output_rows=1,
elapsed_compute=2.091µs] |
| | PlaceholderRowExec, metrics=[]
|
| |
|
+-------------------+----------------------------------------------------------------------------------------------------------------------------------------------------+
1 row(s) fetched.
Elapsed 0.001 seconds.
```
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