jiayuasu opened a new pull request, #2669:
URL: https://github.com/apache/sedona/pull/2669

   ## Did you read the Contributor Guide?
   
   - Yes, I have read the [Contributor 
Rules](https://sedona.apache.org/latest/community/rule/) and [Contributor 
Development Guide](https://sedona.apache.org/latest/community/develop/)
   
   ## Is this PR related to a ticket?
   
   - Yes, and the PR name follows the format `[GH-XXX] my subject`. Closes #2652
   
   ## What changes were proposed in this PR?
   
   This PR adds the `RS_AsCOG` SQL function that converts a raster to a Cloud 
Optimized GeoTIFF (COG) byte array. The underlying pure Java COG writer was 
already merged via #2663 (sub-issue #2662). This PR wires it up as a Spark SQL 
function with positional overloads:
   
   ```sql
   RS_AsCOG(raster)
   RS_AsCOG(raster, compression)
   RS_AsCOG(raster, compression, tileSize)
   RS_AsCOG(raster, compression, tileSize, quaRS_AsCOG(raster, compression, 
tileSize, quaRS_AsCOG(rastesRS_AsCOG(raster, coaster,RS_AsCOG(raster, 
compression, tileSize,lingRS_AsCOG(raster)
   
````````````````````````````````````````````````````````````````````````````````tileSi``````````````````````````````````````````````wer
 
````````````````````````````````````````````````````````````````````````````````tileSi``````````````````````````````````````````````wer
 
````````````````````````````````````````````icu```````````````````````````````` 
ove````````````````````````````````````````````````````````````````````````````n/.````````````````````````````````````sitional
 `asCOG()` Java overloads
   - `spark/.../expressions/raster/RasterOutputs.scala` - `RS_AsCOG` Spark SQL 
expression
   - `spark/.../UDF/Catalog.scala` - Function registration
   - `common/.../raster/RasterOutputTest.java` - 8 Java unit tests including 
round-trip
   - `spark/.../sql/rasteralgebraTest.scala` - 5 Spark integration te- 
`spark/.../sql/rasterp
   
   ## How was thi## How was thi## How was thi## How was thi## How was thi## How 
was thi## How was thi## How was thi## How was thi## How was thi## How was thi## 
How was thi## How was thi## How was thi##and count)
   - 5 Spark SQL integration tests in `rasteralgebraTest` covering defaults, 
compression variants, tile size, all arguments, and a round-trip through 
`RS_FromGeoTiff(RS_AsCOG(raster))`
   - All tests pass locally
   
   ## Did this PR include necessary documentation updates?
   
   - No, this PR does not affect any public API so no need to change the 
documentation.


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