uros-db opened a new pull request, #52795:
URL: https://github.com/apache/spark/pull/52795
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### What changes were proposed in this pull request?
Implement the `ST_Srid` expression in Catalyst, and add the corresponding
`st_srid` SQL function.
#### Description
Returns the SRID of the input `GEOGRAPHY` or `GEOMETRY` value.
#### Syntax
```
st_srid(geo)
```
#### Arguments
- `geo`: A `GEOGRAPHY` or `GEOMETRY` value.
#### Returns
- A value of type `INTEGER`.
#### Notes
- The function returns `NULL` if the input is `NULL`.
#### Examples
```
> SELECT
st_srid(st_geogfromwkb(X'0101000000000000000000F03F0000000000000040'));
4326
```
```
> SELECT
st_srid(st_geomfromwkb(X'0101000000000000000000F03F0000000000000040'));
0
```
```
> SELECT st_srid(NULL);
NULL
```
### Why are the changes needed?
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### Does this PR introduce _any_ user-facing change?
Yes, a new SQL function is added: `st_srid`.
### How was this patch tested?
New unit tests in Java/Scala suites:
- `STExpressionsSuite.scala`
- `StUtilsSuite.java`
New end-to-end SQL tests:
- `st-functions.sql`
Finally, manually testing using Spark shell.
### Was this patch authored or co-authored using generative AI tooling?
No.
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