yutannihilation opened a new pull request, #183:
URL: https://github.com/apache/sedona-db/pull/183
This pull request is my attempt to implement `ST_Azimuth()`.
```
> sd_sql("select ST_Azimuth( ST_Point(25, 45), ST_Point(75, 100))")
┌──────────────────────────────────────────────────────────────────────────┐
│ st_azimuth(st_point(Int64(25),Int64(45)),st_point(Int64(75),Int64(100))) │
│ float64 │
╞══════════════════════════════════════════════════════════════════════════╡
│ 0.7378150601204649 │
└──────────────────────────────────────────────────────────────────────────┘
Preview of up to 6 row(s)
```
This pull request is mostly for figuring out how to implement a function so
that I can contribute more. So, please feel free to close if there's another
plan to implement this.
I picked `ST_Azimuth()` because it looks relatively simple. I follow the
implementation of Sedona, although I might not understand the code correctly as
I'm poor at Java...
https://github.com/apache/sedona/blob/f9069e7dc6682d53335f0e0c6fb4bd444024d3b5/common/src/main/java/org/apache/sedona/common/Functions.java#L202-L209
I think the implementation is straightforward. One thing to note is that, if
I understand the Sedona's implementation correctly, it returns `0.0` when the
two points are the same. However, PostGIS returns `NULL`. [The
document](https://postgis.net/docs/en/ST_Azimuth.html) says:
> NULL if the two points are coincident
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