| /** |
| * 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.common.base.Objects; |
| import com.google.common.base.Preconditions; |
| import com.google.gson.annotations.Expose; |
| import org.apache.tajo.catalog.FunctionDesc; |
| import org.apache.tajo.catalog.Schema; |
| import org.apache.tajo.common.TajoDataTypes; |
| import org.apache.tajo.common.TajoDataTypes.DataType; |
| import org.apache.tajo.datum.Datum; |
| import org.apache.tajo.storage.Tuple; |
| import org.apache.tajo.util.TUtil; |
| |
| import static org.apache.tajo.catalog.proto.CatalogProtos.FunctionType.DISTINCT_AGGREGATION; |
| import static org.apache.tajo.catalog.proto.CatalogProtos.FunctionType.DISTINCT_UDA; |
| |
| public abstract class FunctionEval extends EvalNode implements Cloneable { |
| public static enum ParamType { |
| CONSTANT, VARIABLE, NULL |
| } |
| |
| @Expose protected FunctionDesc funcDesc; |
| @Expose protected EvalNode [] argEvals; |
| |
| public FunctionEval(EvalType type, FunctionDesc funcDesc, EvalNode[] argEvals) { |
| super(type); |
| this.funcDesc = funcDesc; |
| Preconditions.checkArgument(argEvals != null, "argEvals cannot be null"); |
| this.argEvals = argEvals; |
| } |
| |
| public ParamType [] getParamType() { |
| ParamType [] paramTypes = new ParamType[argEvals.length]; |
| for (int i = 0; i < argEvals.length; i++) { |
| if (argEvals[i].getType() == EvalType.CONST) { |
| if (argEvals[i].getValueType().getType() == TajoDataTypes.Type.NULL_TYPE) { |
| paramTypes[i] = ParamType.NULL; |
| } else { |
| paramTypes[i] = ParamType.CONSTANT; |
| } |
| } else { |
| paramTypes[i] = ParamType.VARIABLE; |
| } |
| } |
| return paramTypes; |
| } |
| |
| public boolean isDistinct() { |
| return funcDesc.getFuncType() == DISTINCT_AGGREGATION || funcDesc.getFuncType() == DISTINCT_UDA; |
| } |
| |
| public EvalNode [] getArgs() { |
| return this.argEvals; |
| } |
| |
| public void setArgs(EvalNode [] args) { |
| this.argEvals = args; |
| } |
| |
| public DataType getValueType() { |
| return this.funcDesc.getReturnType(); |
| } |
| |
| @Override |
| public abstract Datum eval(Schema schema, Tuple tuple); |
| |
| @Override |
| public String getName() { |
| return funcDesc.getSignature(); |
| } |
| |
| public FunctionDesc getFuncDesc() { |
| return this.funcDesc; |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder sb = new StringBuilder(); |
| for(int i=0; i < argEvals.length; i++) { |
| sb.append(argEvals[i]); |
| if(i+1 < argEvals.length) |
| sb.append(","); |
| } |
| return funcDesc.getSignature() + "(" + (isDistinct() ? " distinct" : "") + sb+")"; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj instanceof FunctionEval) { |
| FunctionEval other = (FunctionEval) obj; |
| |
| boolean b1 = this.type == other.type; |
| boolean b2 = TUtil.checkEquals(funcDesc, other.funcDesc); |
| boolean b3 = TUtil.checkEquals(argEvals, other.argEvals); |
| return b1 && b2 && b3; |
| } |
| |
| return false; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hashCode(funcDesc, argEvals); |
| } |
| |
| @Override |
| public Object clone() throws CloneNotSupportedException { |
| FunctionEval eval = (FunctionEval) super.clone(); |
| eval.funcDesc = (FunctionDesc) funcDesc.clone(); |
| if (argEvals != null) { |
| eval.argEvals = new EvalNode[argEvals.length]; |
| for (int i = 0; i < argEvals.length; i++) { |
| eval.argEvals[i] = (EvalNode) argEvals[i].clone(); |
| } |
| } |
| return eval; |
| } |
| |
| @Override |
| public void preOrder(EvalNodeVisitor visitor) { |
| if (argEvals != null) { |
| for (EvalNode eval : argEvals) { |
| eval.postOrder(visitor); |
| } |
| } |
| visitor.visit(this); |
| } |
| |
| @Override |
| public void postOrder(EvalNodeVisitor visitor) { |
| if (argEvals != null) { |
| for (EvalNode eval : argEvals) { |
| eval.postOrder(visitor); |
| } |
| } |
| visitor.visit(this); |
| } |
| } |