alamb commented on issue #16453:
URL: https://github.com/apache/datafusion/issues/16453#issuecomment-4834662125
How about rewriting
```sql
SELECT window_start, window_end, window_duration, avg(value) FROM t GROUP BY
session_window(ts, INTERVAL '30' SECOND);
```
Into a UDF that returns a struct
```sql
SELECT augmented_avg(ts, value) FROM t GROUP BY session_window(ts, INTERVAL
'30' SECOND);
```
Then the augmented avg could return a struct like
```json
{
window_start: ts,
window_end: ts,
window_duration: duration,
avg_value: ..
}
```
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