cloud-fan commented on code in PR #53009:
URL: https://github.com/apache/spark/pull/53009#discussion_r2538496010


##########
sql/api/src/main/scala/org/apache/spark/sql/internal/types/SpatialReferenceSystemCache.java:
##########
@@ -17,12 +17,15 @@
 
 package org.apache.spark.sql.internal.types;
 
+import org.apache.spark.annotation.Unstable;
+
 import java.util.HashMap;
 import java.util.List;
 
 /**
  * Class for maintaining the mappings between supported SRID/CRS values and 
the corresponding SRS.
  */
+@Unstable
 public class SpatialReferenceSystemCache {

Review Comment:
   seems `SpatialReferenceSystemMapper` is a better name? For user-facing API, 
using cache or not is an internal details.



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