RyanBerti commented on code in PR #40615:
URL: https://github.com/apache/spark/pull/40615#discussion_r1172949405


##########
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/aggregate/DatasketchesHllSketchSuite.scala:
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@@ -0,0 +1,111 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.catalyst.expressions.aggregate
+
+import scala.collection.immutable.NumericRange
+import scala.util.Random
+
+import org.apache.datasketches.hll.HllSketch
+import org.apache.datasketches.memory.Memory
+
+import org.apache.spark.SparkFunSuite
+import org.apache.spark.sql.catalyst.InternalRow
+import org.apache.spark.sql.catalyst.expressions.{BoundReference, 
HllSketchEstimate}
+import org.apache.spark.sql.types.{BinaryType, DataType, IntegerType, 
LongType, StringType}
+import org.apache.spark.unsafe.types.UTF8String
+
+
+class DatasketchesHllSketchSuite extends SparkFunSuite {

Review Comment:
   > Same for the register size (although I think it should go away from the 
API wherever it appears).
   
   Looks like [the Druid implementation supports specifying 
tgtHllType](https://druid.apache.org/docs/latest/development/extensions-core/datasketches-hll.html),
 though [the original Hive UDFs 
don't](https://datasketches.apache.org/docs/HLL/HllHiveUDFs.html). Can you 
clarify why you don't think register size should be configurable in this 
implementation? 



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