/*
* Licensed 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 com.facebook.presto.execution;
import com.facebook.presto.Session;
import com.facebook.presto.metadata.Metadata;
import com.facebook.presto.metadata.QualifiedObjectName;
import com.facebook.presto.metadata.TableHandle;
import com.facebook.presto.security.AccessControl;
import com.facebook.presto.spi.ColumnHandle;
import com.facebook.presto.spi.ColumnMetadata;
import com.facebook.presto.spi.type.Type;
import com.facebook.presto.sql.analyzer.SemanticException;
import com.facebook.presto.sql.tree.AddColumn;
import com.facebook.presto.sql.tree.ColumnDefinition;
import com.facebook.presto.sql.tree.Expression;
import com.facebook.presto.transaction.TransactionManager;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import static com.facebook.presto.metadata.MetadataUtil.createQualifiedObjectName;
import static com.facebook.presto.spi.type.TypeSignature.parseTypeSignature;
import static com.facebook.presto.sql.analyzer.SemanticErrorCode.COLUMN_ALREADY_EXISTS;
import static com.facebook.presto.sql.analyzer.SemanticErrorCode.MISSING_TABLE;
import static com.facebook.presto.sql.analyzer.SemanticErrorCode.TYPE_MISMATCH;
import static com.facebook.presto.type.UnknownType.UNKNOWN;
import static com.google.common.util.concurrent.Futures.immediateFuture;
import static java.util.Locale.ENGLISH;
public class AddColumnTask
implements DataDefinitionTask<AddColumn>
{
@Override
public String getName()
{
return "ADD COLUMN";
}
@Override
public ListenableFuture<?> execute(AddColumn statement, TransactionManager transactionManager, Metadata metadata, AccessControl accessControl, QueryStateMachine stateMachine, List<Expression> parameters)
{
Session session = stateMachine.getSession();
QualifiedObjectName tableName = createQualifiedObjectName(session, statement, statement.getName());
Optional<TableHandle> tableHandle = metadata.getTableHandle(session, tableName);
if (!tableHandle.isPresent()) {
throw new SemanticException(MISSING_TABLE, statement, "Table '%s' does not exist", tableName);
}
accessControl.checkCanAddColumns(session.getRequiredTransactionId(), session.getIdentity(), tableName);
Map<String, ColumnHandle> columnHandles = metadata.getColumnHandles(session, tableHandle.get());
ColumnDefinition element = statement.getColumn();
Type type = metadata.getType(parseTypeSignature(element.getType()));
if ((type == null) || type.equals(UNKNOWN)) {
throw new SemanticException(TYPE_MISMATCH, element, "Unknown type for column '%s' ", element.getName());
}
if (columnHandles.containsKey(element.getName().toLowerCase(ENGLISH))) {
throw new SemanticException(COLUMN_ALREADY_EXISTS, statement, "Column '%s' already exists", element.getName());
}
metadata.addColumn(session, tableHandle.get(), new ColumnMetadata(element.getName(), type));
return immediateFuture(null);
}
}