Pushdown of spatial sort-by-distance does not allow partial sorts #114515
Description
The work done in #112938 does most of the work to enable partial sorts, but the last change was disabled to keep the PR from growing even larger. We would like to re-enable this, but also by first writing a benchmark that demonstrates that it actually helps.
Consider the following query:
FROM airports
| EVAL scale = 10 - scalerank
| EVAL distance = ST_DISTANCE(location, TO_GEOPOINT("POINT(12.565 55.673)"))
| SORT distance ASC, scale DESC
| LIMIT 10
This could have the sort by distance pushed down, but leave the sort by scale for the compute engine. This should improve performance, but we would like a benchmark to validate that.