Github user jihoonson commented on a diff in the pull request:
https://github.com/apache/tajo/pull/13#discussion_r13899755
--- Diff:
tajo-core/src/main/java/org/apache/tajo/engine/eval/WindowFunctionEval.java ---
@@ -0,0 +1,99 @@
+/**
+ * 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.tajo.engine.eval;
+
+import com.google.gson.annotations.Expose;
+import org.apache.tajo.catalog.FunctionDesc;
+import org.apache.tajo.catalog.Schema;
+import org.apache.tajo.catalog.SortSpec;
+import org.apache.tajo.common.TajoDataTypes.DataType;
+import org.apache.tajo.datum.Datum;
+import org.apache.tajo.engine.function.AggFunction;
+import org.apache.tajo.engine.function.FunctionContext;
+import org.apache.tajo.engine.planner.logical.WindowSpec;
+import org.apache.tajo.storage.Tuple;
+import org.apache.tajo.storage.VTuple;
+
+public class WindowFunctionEval extends AggregationFunctionCallEval
implements Cloneable {
+ @Expose private SortSpec [] sortSpecs;
+ @Expose WindowSpec.WindowFrame windowFrame;
+ private Tuple params;
+
+ public WindowFunctionEval(FunctionDesc desc, AggFunction instance,
EvalNode[] givenArgs,
+ WindowSpec.WindowFrame windowFrame) {
+ super(EvalType.WINDOW_FUNCTION, desc, instance, givenArgs);
+ this.windowFrame = windowFrame;
+ }
+
+ public boolean hasSortSpecs() {
+ return sortSpecs != null;
+ }
+
+ public void setSortSpecs(SortSpec [] sortSpecs) {
+ this.sortSpecs = sortSpecs;
+ }
+
+ public SortSpec [] getSortSpecs() {
+ return sortSpecs;
+ }
+
+ public WindowSpec.WindowFrame getWindowFrame() {
+ return windowFrame;
+ }
+
+ @Override
+ public Datum eval(Schema schema, Tuple tuple) {
+ throw new UnsupportedOperationException("Cannot execute eval() of
aggregation function");
+ }
+
+ public void merge(FunctionContext context, Schema schema, Tuple tuple) {
+ if (params == null) {
+ this.params = new VTuple(argEvals.length);
+ }
+
+ if (argEvals != null) {
+ for (int i = 0; i < argEvals.length; i++) {
+ params.put(i, argEvals[i].eval(schema, tuple));
+ }
+ }
+
+ instance.eval(context, params);
+ }
+
+ public Datum terminate(FunctionContext context) {
+ return instance.terminate(context);
+ }
+
+ @Override
+ public DataType getValueType() {
+ return funcDesc.getReturnType();
+ }
+
+ @Override
+ public Object clone() throws CloneNotSupportedException {
+ WindowFunctionEval windowFunctionEval = (WindowFunctionEval)
super.clone();
--- End diff --
windowFrame should be cloned.
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