| /* |
| * 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.Join; |
| |
| import com.google.common.collect.ImmutableList; |
| import com.google.common.collect.Lists; |
| |
| import java.util.List; |
| |
| /** |
| * Interpreter node that implements a |
| * {@link org.apache.calcite.rel.core.Join}. |
| */ |
| public class JoinNode implements Node { |
| private final Source leftSource; |
| private final Source rightSource; |
| private final Sink sink; |
| private final Join rel; |
| private final Scalar condition; |
| private final Context context; |
| |
| public JoinNode(Interpreter interpreter, Join rel) { |
| this.leftSource = interpreter.source(rel, 0); |
| this.rightSource = interpreter.source(rel, 1); |
| this.sink = interpreter.sink(rel); |
| this.condition = interpreter.compile(ImmutableList.of(rel.getCondition()), |
| interpreter.combinedRowType(rel.getInputs())); |
| this.rel = rel; |
| this.context = interpreter.createContext(); |
| |
| } |
| |
| public void run() throws InterruptedException { |
| List<Row> rightList = null; |
| final int leftCount = rel.getLeft().getRowType().getFieldCount(); |
| final int rightCount = rel.getRight().getRowType().getFieldCount(); |
| context.values = new Object[rel.getRowType().getFieldCount()]; |
| Row left; |
| Row right; |
| while ((left = leftSource.receive()) != null) { |
| System.arraycopy(left.getValues(), 0, context.values, 0, leftCount); |
| if (rightList == null) { |
| rightList = Lists.newArrayList(); |
| while ((right = rightSource.receive()) != null) { |
| rightList.add(right); |
| } |
| } |
| for (Row right2 : rightList) { |
| System.arraycopy(right2.getValues(), 0, context.values, leftCount, |
| rightCount); |
| final Boolean execute = (Boolean) condition.execute(context); |
| if (execute != null && execute) { |
| sink.send(Row.asCopy(context.values)); |
| } |
| } |
| } |
| } |
| } |
| |
| // End JoinNode.java |