leerho commented on a change in pull request #369:
URL: https://github.com/apache/datasketches-java/pull/369#discussion_r733087371



##########
File path: src/main/java/org/apache/datasketches/theta/AnotBimpl.java
##########
@@ -119,17 +121,22 @@ public CompactSketch aNotB(final Sketch skA, final Sketch 
skB, final boolean dst
     }
     //Both skA & skB are not null
 
+    final long minThetaLong = Math.min(skA.getThetaLong(), skB.getThetaLong());
+
     if (skA.isEmpty()) { return skA.compact(dstOrdered, dstMem); }
+    //A is not Empty
     checkSeedHashes(skA.getSeedHash(), seedHash_);
 
-    if (skB.isEmpty()) { return skA.compact(dstOrdered, dstMem); }
+    if (skB.isEmpty() && skB.getRetainedEntries() == 0) {
+      return skA.compact(dstOrdered, dstMem);
+   }

Review comment:
       This redundant check was in both Theta and Tuple.




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