srowen commented on a change in pull request #32907:
URL: https://github.com/apache/spark/pull/32907#discussion_r651170422



##########
File path: 
common/sketch/src/main/java/org/apache/spark/util/sketch/BloomFilterImpl.java
##########
@@ -220,6 +220,35 @@ public BloomFilter mergeInPlace(BloomFilter other) throws 
IncompatibleMergeExcep
     return this;
   }
 
+  @Override
+  public BloomFilter intersectInPlace(BloomFilter other) throws 
IncompatibleMergeException {
+    // Duplicates the logic of `isCompatible` here to provide better error 
message.
+    if (other == null) {

Review comment:
       I wonder if we can just factor out these checks into a separate private 
utility method, to avoid the duplication?




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