org.apache.hadoop.hive.metastore.StorageSchemaReader Maven / Gradle / Ivy
Show all versions of hive-apache Show documentation
/*
* 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.metastore;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.metastore.api.EnvironmentContext;
import org.apache.hadoop.hive.metastore.api.FieldSchema;
import org.apache.hadoop.hive.metastore.api.MetaException;
import org.apache.hadoop.hive.metastore.api.Table;
import java.util.List;
/**
* An interface to implement reading schemas from stored data.
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
interface StorageSchemaReader {
/**
* Read the schema from the storage representation of the table.
* @param tbl metastore table object
* @param envContext environment context
* @param conf current configuration file
* @return list of field schemas
* @throws MetaException if the table storage could not be read
*/
List readSchema(Table tbl, EnvironmentContext envContext, Configuration conf)
throws MetaException;
}