org.apache.hadoop.hive.ql.optimizer.calcite.druid.DruidSchema.java Source code

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Here is the source code for org.apache.hadoop.hive.ql.optimizer.calcite.druid.DruidSchema.java

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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.hadoop.hive.ql.optimizer.calcite.druid;

import java.util.Map;

import org.apache.calcite.schema.Table;
import org.apache.calcite.schema.impl.AbstractSchema;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;

/**
 * Schema mapped onto a Druid instance.
 *
 * TODO: to be removed when Calcite is upgraded to 1.9
 */
public class DruidSchema extends AbstractSchema {
    final String url;

    /**
     * Creates a Druid schema.
     *
     * @param url URL of query REST service
     */
    public DruidSchema(String url) {
        this.url = Preconditions.checkNotNull(url);
    }

    @Override
    protected Map<String, Table> getTableMap() {
        final ImmutableMap.Builder<String, Table> builder = ImmutableMap.builder();
        return builder.build();
    }
}

// End DruidSchema.java