Github user gparai commented on a diff in the pull request:
https://github.com/apache/drill/pull/729#discussion_r103619932
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/statistics/AbstractMergedStatistic.java
---
@@ -0,0 +1,52 @@
+/*
+ * 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.exec.vector.ValueVector;
+
+public abstract class AbstractMergedStatistic extends Statistic implements
MergedStatistic {
+ @Override
+ public String getName() {
+ throw new UnsupportedOperationException("getName() not implemented");
+ }
+
+ @Override
+ public String getInput() {
+ throw new UnsupportedOperationException("getInput() not implemented");
+ }
+
+ @Override
+ public void merge(ValueVector input) {
+ throw new UnsupportedOperationException("merge() not implemented");
+ }
+
+ @Override
+ public Object getStat(String colName) {
+ throw new UnsupportedOperationException("getStat() not implemented");
+ }
+
+ @Override
+ public void setOutput(ValueVector output) {
+ throw new UnsupportedOperationException("getOutput() not implemented");
+ }
+
+ @Override
+ public void configure(Object configurations) {
--- End diff --
Changed the types to be specific. This config does not do hash lookups.
However, for functions like `merge()` and `setOutput()` do hash lookups which
might not be as expensive given the alternative (columns mappings for
`MapVector` which needs to be recomputed for each incoming batch). Also, all
the `MergedStatistic` and `StatisticsMergeBatch` contain a single map and given
that both the incoming(no. of minor fragments) and outgoing batches(1) would
not be many we can keep the code simple here.
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