599166320 commented on PR #13168:
URL: https://github.com/apache/druid/pull/13168#issuecomment-1273490010
>
The query with `__time` as the prefix and the sorting direction is the same
as `__time`, as shown below:
```
order by __time,a,b,c
order by __time desc,a desc,b desc
```
In the above two cases, I think we can consider taking a special path. The
special path here is the `Segment by segment decision` you mentioned above
At present, I think of two ways to improve:
1. It is up to the user to decide whether to run a special path by passing
parameters in the query context
2. According to the ingestion specs `dimensionsSpec`, let `druid`
automatically decide to take a special path.
For example:
```
dimensionsSpec{dimensions:[a,b,c,d,e,f,....]}
```
If the user's `ingestion specs` is configured as above, does druid sort the
ingested data? If sorting already exists, the following queries can be run on
special paths:
```
order by __time,a,b,c
order by __time desc,a desc,b desc
```
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