/**
* 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.engine.function.AggFunction;
import org.apache.tajo.engine.function.FunctionContext;
import org.apache.tajo.common.TajoDataTypes.DataType;
import org.apache.tajo.datum.Datum;
import org.apache.tajo.storage.Tuple;
import org.apache.tajo.storage.VTuple;
public class AggregationFunctionCallEval extends FunctionEval implements Cloneable {
@Expose protected AggFunction instance;
@Expose boolean firstPhase = false;
private Tuple params;
public AggregationFunctionCallEval(FunctionDesc desc, AggFunction instance, EvalNode[] givenArgs) {
super(EvalType.AGG_FUNCTION, desc, givenArgs);
this.instance = instance;
}
@Override
public EvalContext newContext() {
return new AggFunctionCtx(argEvals, instance.newContext());
}
@Override
public void eval(EvalContext ctx, Schema schema, Tuple tuple) {
AggFunctionCtx localCtx = (AggFunctionCtx) ctx;
if (params == null) {
this.params = new VTuple(argEvals.length);
}
if (argEvals != null) {
params.clear();
for (int i = 0; i < argEvals.length; i++) {
argEvals[i].eval(localCtx.argCtxs[i], schema, tuple);
params.put(i, argEvals[i].terminate(localCtx.argCtxs[i]));
}
}
if (firstPhase) {
instance.eval(localCtx.funcCtx, params);
} else {
instance.merge(localCtx.funcCtx, params);
}
}
@Override
public Datum terminate(EvalContext ctx) {
if (firstPhase) {
return instance.getPartialResult(((AggFunctionCtx)ctx).funcCtx);
} else {
return instance.terminate(((AggFunctionCtx)ctx).funcCtx);
}
}
@Override
public DataType getValueType() {
if (firstPhase) {
return instance.getPartialResultType();
} else {
return funcDesc.getReturnType();
}
}
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
public void setFirstPhase() {
this.firstPhase = true;
}
protected class AggFunctionCtx extends FuncCallCtx {
FunctionContext funcCtx;
AggFunctionCtx(EvalNode [] argEvals, FunctionContext funcCtx) {
super(argEvals);
this.funcCtx = funcCtx;
}
}
}