spark GetCatalogsOperation 源码
spark GetCatalogsOperation 代码
文件路径：/sql/hive-thriftserver/src/main/java/org/apache/hive/service/cli/operation/GetCatalogsOperation.java
/*
* 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.hive.service.cli.operation;
import org.apache.hadoop.hive.ql.security.authorization.plugin.HiveOperationType;
import org.apache.hive.service.cli.*;
import org.apache.hive.service.cli.session.HiveSession;
import org.apache.hive.service.rpc.thrift.TRowSet;
import org.apache.hive.service.rpc.thrift.TTableSchema;
/**
* GetCatalogsOperation.
*
*/
public class GetCatalogsOperation extends MetadataOperation {
private static final TableSchema RESULT_SET_SCHEMA = new TableSchema()
.addStringColumn("TABLE_CAT", "Catalog name. NULL if not applicable.");
protected final RowSet rowSet;
protected GetCatalogsOperation(HiveSession parentSession) {
super(parentSession, OperationType.GET_CATALOGS);
rowSet = RowSetFactory.create(RESULT_SET_SCHEMA, getProtocolVersion(), false);
}
@Override
public void runInternal() throws HiveSQLException {
setState(OperationState.RUNNING);
try {
if (isAuthV2Enabled()) {
authorizeMetaGets(HiveOperationType.GET_CATALOGS, null);
}
setState(OperationState.FINISHED);
} catch (HiveSQLException e) {
setState(OperationState.ERROR);
throw e;
}
}
/* (non-Javadoc)
* @see org.apache.hive.service.cli.Operation#getResultSetSchema()
*/
@Override
public TTableSchema getResultSetSchema() throws HiveSQLException {
return RESULT_SET_SCHEMA.toTTableSchema();
}
/* (non-Javadoc)
* @see org.apache.hive.service.cli.Operation#getNextRowSet(org.apache.hive.service.cli.FetchOrientation, long)
*/
@Override
public TRowSet getNextRowSet(FetchOrientation orientation, long maxRows) throws HiveSQLException {
assertState(OperationState.FINISHED);
validateDefaultFetchOrientation(orientation);
if (orientation.equals(FetchOrientation.FETCH_FIRST)) {
rowSet.setStartOffset(0);
}
return rowSet.extractSubset((int)maxRows).toTRowSet();
}
}
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