/**
* 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.index;
import java.util.List;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.metastore.api.FieldSchema;
import org.apache.hadoop.hive.metastore.api.Index;
import org.apache.hadoop.hive.ql.metadata.HiveUtils;
import org.apache.hadoop.hive.ql.parse.ParseContext;
import org.apache.hadoop.hive.ql.plan.ExprNodeDesc;
/**
* Abstract base class for index handlers. This is provided as insulation
* so that as HiveIndexHandler evolves, default implementations of new
* methods can be added here in order to avoid breaking existing
* plugin implementations.
*/
public abstract class AbstractIndexHandler implements HiveIndexHandler {
public static String getColumnNames(List<FieldSchema> fieldSchemas) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < fieldSchemas.size(); i++) {
if (i > 0) {
sb.append(",");
}
sb.append(HiveUtils.unparseIdentifier(fieldSchemas.get(i).getName()));
}
return sb.toString();
}
public void generateIndexQuery(Index index, ExprNodeDesc predicate,
ParseContext pctx, HiveIndexQueryContext queryContext) {
queryContext.setQueryTasks(null);
return;
}
public boolean checkQuerySize(long inputSize, HiveConf conf) {
return false;
}
}