| /* |
| * 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.drill.common.logical.data; |
| |
| import com.fasterxml.jackson.annotation.JsonCreator; |
| import com.fasterxml.jackson.annotation.JsonTypeName; |
| import org.apache.drill.common.logical.data.visitors.LogicalVisitor; |
| |
| /** |
| * Implementation of {@link LogicalOperator} for {@code MetadataHandlerRel} rel node. |
| */ |
| @JsonTypeName("metadataHandler") |
| public class MetadataHandler extends SingleInputOperator { |
| |
| @JsonCreator |
| public MetadataHandler() { |
| } |
| |
| @Override |
| public <T, X, E extends Throwable> T accept(LogicalVisitor<T, X, E> logicalVisitor, X value) throws E { |
| throw new UnsupportedOperationException("MetadataHandler does not support visitors"); |
| } |
| } |