Github user gparai commented on a diff in the pull request:
https://github.com/apache/drill/pull/729#discussion_r103618796
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/statistics/AvgWidthMergedStatistic.java
---
@@ -0,0 +1,135 @@
+/*
+ * 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
+ * <p/>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p/>
+ * 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.drill.exec.physical.impl.statistics;
+
+import org.apache.drill.common.types.TypeProtos;
+import org.apache.drill.exec.expr.holders.NullableFloat8Holder;
+import org.apache.drill.exec.expr.holders.ValueHolder;
+import org.apache.drill.exec.vector.NullableFloat8Vector;
+import org.apache.drill.exec.vector.ValueVector;
+import org.apache.drill.exec.vector.complex.MapVector;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class AvgWidthMergedStatistic extends AbstractMergedStatistic {
+
+ private String name;
+ private String inputName;
+ private boolean configureComplete = false;
+ private boolean mergeComplete = false;
+ private Map<String, ValueHolder> sumHolder;
+ MergedStatistic types, nonNullStatCounts, statCounts;
+
+ public AvgWidthMergedStatistic (String name, String inputName) {
+ this.name = name;
+ this.inputName = inputName;
+ this.sumHolder = new HashMap<>();
+ types = nonNullStatCounts = statCounts = null;
+ }
+
+ @Override
+ public String getName() {
+ return name;
+ }
+
+ @Override
+ public String getInput() {
+ return inputName;
+ }
+
+ @Override
+ public void merge(ValueVector input) {
+ // Check the input is a Map Vector
+ assert (input.getField().getType().getMinorType() ==
TypeProtos.MinorType.MAP);
+ MapVector inputMap = (MapVector) input;
+ for (ValueVector vv : inputMap) {
+ String colName = vv.getField().getLastName();
+ NullableFloat8Holder colSumHolder;
+ if (sumHolder.get(colName) != null) {
+ colSumHolder = (NullableFloat8Holder) sumHolder.get(colName);
+ } else {
+ colSumHolder = new NullableFloat8Holder();
+ sumHolder.put(colName, colSumHolder);
+ }
+ Object val = vv.getAccessor().getObject(0);
+ if (val != null) {
+ colSumHolder.value += (double) val;
+ colSumHolder.isSet = 1;
+ }
+ }
+ }
+
+ @Override
+ public Object getStat(String colName) {
+ if (mergeComplete != true) {
+ throw new IllegalStateException(
+ String.format("Statistic `%s` has not completed merging
statistics", name));
+ }
+ NullableFloat8Holder colSumHolder = (NullableFloat8Holder)
sumHolder.get(colName);
+ return (long) (colSumHolder.value/ getRowCount(colName));
+ }
+
+ @Override
+ public void setOutput(ValueVector output) {
+ // Check the input is a Map Vector
+ assert (output.getField().getType().getMinorType() ==
TypeProtos.MinorType.MAP);
+ // Dependencies have been configured correctly
+ assert (configureComplete == true);
+ MapVector outputMap = (MapVector) output;
+
+ for (ValueVector outMapCol : outputMap) {
+ String colName = outMapCol.getField().getLastName();
+ NullableFloat8Holder colSumHolder = (NullableFloat8Holder)
sumHolder.get(colName);
+ NullableFloat8Vector vv = (NullableFloat8Vector) outMapCol;
+ vv.allocateNewSafe();
+ vv.getMutator().setSafe(0, (colSumHolder.value /
getRowCount(colName)));
+ }
+ mergeComplete = true;
+ }
+
+ @Override
+ public void configure(Object configurations) {
+ List<MergedStatistic> statistics = (List<MergedStatistic>)
configurations;
--- End diff --
Done
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