alamb commented on issue #361:
URL:
https://github.com/apache/arrow-datafusion/issues/361#issuecomment-1249722996
For anyone following this, a window frame query looks like this (the `ROWS
BETWEEN 2 PRECEDING AND 0 FOLLOWING`)
```sql
SELECT water_level, avg(water_level) OVER (ORDER BY time desc ROWS BETWEEN 2
PRECEDING AND 0 FOLLOWING)
FROM
"h2o_feet"
WHERE
time >= cast ('2019-09-17T20:00:00Z' as timestamp) AND
time <= cast ('2019-09-17T21:42:00Z' as timestamp);
```
Which results in an error
```
This feature is not implemented: window expression with window frame
definition is not yet supported
```
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