/*
* 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.ViewDefinition;
import com.facebook.presto.security.AccessControl;
import com.facebook.presto.sql.analyzer.Analysis;
import com.facebook.presto.sql.analyzer.Analyzer;
import com.facebook.presto.sql.analyzer.FeaturesConfig;
import com.facebook.presto.sql.parser.SqlParser;
import com.facebook.presto.sql.tree.CreateView;
import com.facebook.presto.sql.tree.Expression;
import com.facebook.presto.sql.tree.Statement;
import com.facebook.presto.transaction.TransactionManager;
import com.google.common.util.concurrent.ListenableFuture;
import io.airlift.json.JsonCodec;
import javax.inject.Inject;
import java.util.List;
import java.util.Optional;
import static com.facebook.presto.metadata.MetadataUtil.createQualifiedObjectName;
import static com.facebook.presto.metadata.ViewDefinition.ViewColumn;
import static com.facebook.presto.sql.SqlFormatterUtil.getFormattedSql;
import static com.google.common.collect.ImmutableList.toImmutableList;
import static com.google.common.util.concurrent.Futures.immediateFuture;
import static java.util.Objects.requireNonNull;
public class CreateViewTask
implements DataDefinitionTask<CreateView>
{
private final JsonCodec<ViewDefinition> codec;
private final SqlParser sqlParser;
@Inject
public CreateViewTask(
JsonCodec<ViewDefinition> codec,
SqlParser sqlParser,
FeaturesConfig featuresConfig)
{
this.codec = requireNonNull(codec, "codec is null");
this.sqlParser = requireNonNull(sqlParser, "sqlParser is null");
requireNonNull(featuresConfig, "featuresConfig is null");
}
@Override
public String getName()
{
return "CREATE VIEW";
}
@Override
public String explain(CreateView statement, List<Expression> parameters)
{
return "CREATE VIEW " + statement.getName();
}
@Override
public ListenableFuture<?> execute(CreateView statement, TransactionManager transactionManager, Metadata metadata, AccessControl accessControl, QueryStateMachine stateMachine, List<Expression> parameters)
{
Session session = stateMachine.getSession();
QualifiedObjectName name = createQualifiedObjectName(session, statement, statement.getName());
accessControl.checkCanCreateView(session.getRequiredTransactionId(), session.getIdentity(), name);
String sql = getFormattedSql(statement.getQuery(), sqlParser, Optional.of(parameters));
Analysis analysis = analyzeStatement(statement, session, metadata, accessControl, parameters);
List<ViewColumn> columns = analysis.getOutputDescriptor(statement.getQuery())
.getVisibleFields().stream()
.map(field -> new ViewColumn(field.getName().get(), field.getType()))
.collect(toImmutableList());
String data = codec.toJson(new ViewDefinition(sql, session.getCatalog(), session.getSchema(), columns, Optional.of(session.getUser())));
metadata.createView(session, name, data, statement.isReplace());
return immediateFuture(null);
}
private Analysis analyzeStatement(Statement statement, Session session, Metadata metadata, AccessControl accessControl, List<Expression> parameters)
{
Analyzer analyzer = new Analyzer(session, metadata, sqlParser, accessControl, Optional.empty(), parameters);
return analyzer.analyze(statement);
}
}