anshu-makkar commented on code in PR #13819:
URL: https://github.com/apache/druid/pull/13819#discussion_r1115303426
##########
docs/development/extensions-core/datasketches-tuple.md:
##########
@@ -207,3 +207,39 @@ Returns a human-readable summary of a given
ArrayOfDoublesSketch. This is a stri
"field" : <post aggregator that refers to an ArrayOfDoublesSketch
(fieldAccess or another post aggregator)>
}
```
+
+
+### Constant ArrayOfDoublesSketch
+
+This post aggregator adds a Base64-encoded constant ArrayOfDoublesSketch value
that you can use in other post aggregators.
+```json
+{
+ "type": "arrayOfDoublesSketchConstant",
+ "name": DESTINATION_COLUMN_NAME,
+ "value": CONSTANT_SKETCH_VALUE
+}
+```
+
+### Base64 output of ArrayOfDoublesSketch
+
+This post aggregator outputs an ArrayOfDoublesSketch as a Base64-encoded
string storing the constant tuple sketch value that you can use in other post
aggregators.
+
+```json
+{
+ "type": "arrayOfDoublesSketchToBase64String",
+ "name": DESTINATION_COLUMN_NAME,
+ "field": <post aggregator that refers to a ArrayOfDoublesSketch (fieldAccess
or another post aggregator)>
+}
+```
+
+### Estimated metrics values for each column of ArrayOfDoublesSketch
+
+This post aggregator returns a list of estimated values(sum) from a given
ArrayOfDoublesSketch. The result is _N_ double values, where _N_ is the number
of double values kept in the sketch per key.
Review Comment:
You mean the `type` field in the post-aggregator?
##########
extensions-core/datasketches/src/main/java/org/apache/druid/query/aggregation/datasketches/tuple/ArrayOfDoublesSketchConstantPostAggregator.java:
##########
@@ -0,0 +1,156 @@
+/*
+ * 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.druid.query.aggregation.datasketches.tuple;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.google.common.base.Preconditions;
+import org.apache.commons.codec.digest.DigestUtils;
+import org.apache.datasketches.tuple.arrayofdoubles.ArrayOfDoublesSketch;
+import org.apache.datasketches.tuple.arrayofdoubles.ArrayOfDoublesSketches;
+import org.apache.druid.java.util.common.StringUtils;
+import org.apache.druid.java.util.common.guava.Comparators;
+import org.apache.druid.query.aggregation.AggregatorFactory;
+import org.apache.druid.query.aggregation.AggregatorUtil;
+import org.apache.druid.query.cache.CacheKeyBuilder;
+import org.apache.druid.segment.data.SafeWritableMemory;
+
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * This post-aggregator converts a given Base64 encoded string to an
ArrayOfDoublesSketch.
+ * The input column contains name of post-aggregator output and base64 encoded
input string.
+ * The output is a deserialized {@link ArrayOfDoublesSketch} .
+ */
+public class ArrayOfDoublesSketchConstantPostAggregator extends
ArrayOfDoublesSketchPostAggregator
+{
+
+ private final String value;
+ private final ArrayOfDoublesSketch sketchValue;
+
+ @JsonCreator
+ public ArrayOfDoublesSketchConstantPostAggregator(@JsonProperty("name")
String name, @JsonProperty("value") String value)
+ {
+ super(name);
+ Preconditions.checkArgument(value != null && !value.isEmpty(),
+ "Constant value cannot be null or empty, expecting base64 encoded
sketch string");
+ this.value = value;
+ this.sketchValue = deserializeSafe(value);
Review Comment:
ok.
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