/
Executor.java
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/
Executor.java
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/*
* Copyright [2013-2021], Alibaba Group Holding Limited
*
* Licensed 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 com.alibaba.polardbx.executor.operator;
import com.alibaba.polardbx.optimizer.chunk.Chunk;
import com.alibaba.polardbx.optimizer.core.datatype.DataType;
import java.util.List;
/**
* Basic interface for operators
*/
public interface Executor extends ProducerExecutor {
/**
* This method is called immediately before any chunk are processed, it should contain the
* operator's initialization logic.
*
* @throws java.lang.Exception An exception in this method causes the operator to fail.
*/
void open();
/**
* output the result
*/
Chunk nextChunk();
/**
* This method is called after all records have been added to the operators via the methods
*/
void close();
List<DataType> getDataTypes();
/**
* get the inputs of operators
*/
List<Executor> getInputs();
/**
* set the id which is flag for this operator.
*/
default void setId(int id) {
throw new UnsupportedOperationException(getClass().getName());
}
default int getId() {
throw new UnsupportedOperationException(getClass().getName());
}
}