jiayuasu opened a new pull request, #2622:
URL: https://github.com/apache/sedona/pull/2622

   ## 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 #1979
   
   ## What changes were proposed in this PR?
   
   ST_Envelope (scalar): Already correctly returns same-type EMPTY geometry for 
empty inputs (matching PostGIS). Added test to verify this behavior.
   
   ST_Envelope_Aggr (aggregate): Skip empty geometries during accumulation and 
return null when all inputs are empty, matching PostGIS ST_Extent behavior. 
Fixed in Spark (AggregateFunctions.scala), Flink (Aggregators.java), and 
Snowflake (ST_Envelope_Aggr.java, ST_Envelope_Agg.java).
   
   
   ## How was this patch tested?
   
   Added tests in Spark (aggregateFunctionTestScala: all-empty returns null, 
mixed empty/non-empty preserves valid envelope), Flink (AggregatorTest: 
all-empty returns null), and common (FunctionsTest: scalar envelope with empty 
geometries).
   
   ## 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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