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/*
* 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.calcite.interpreter;
import org.apache.calcite.rel.core.Union;
import com.google.common.collect.ImmutableList;
import java.util.HashSet;
import java.util.Set;
/**
* Interpreter node that implements a
* {@link org.apache.calcite.rel.core.Union}.
*/
public class UnionNode implements Node {
private final ImmutableList sources;
private final Sink sink;
private final Union rel;
public UnionNode(Compiler compiler, Union rel) {
ImmutableList.Builder builder = ImmutableList.builder();
for (int i = 0; i < rel.getInputs().size(); i++) {
builder.add(compiler.source(rel, i));
}
this.sources = builder.build();
this.sink = compiler.sink(rel);
this.rel = rel;
}
public void run() throws InterruptedException {
final Set rows = rel.all ? null : new HashSet<>();
for (Source source : sources) {
Row row;
while ((row = source.receive()) != null) {
if (rows == null || rows.add(row)) {
sink.send(row);
}
}
}
}
}
// End UnionNode.java
