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io.trino.execution.CommentTask Maven / Gradle / Ivy
/*
* 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 io.trino.execution;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.inject.Inject;
import io.trino.Session;
import io.trino.execution.warnings.WarningCollector;
import io.trino.metadata.MaterializedViewDefinition;
import io.trino.metadata.Metadata;
import io.trino.metadata.QualifiedObjectName;
import io.trino.metadata.RedirectionAwareTableHandle;
import io.trino.metadata.TableHandle;
import io.trino.metadata.ViewColumn;
import io.trino.metadata.ViewDefinition;
import io.trino.security.AccessControl;
import io.trino.spi.connector.ColumnHandle;
import io.trino.sql.tree.Comment;
import io.trino.sql.tree.Expression;
import io.trino.sql.tree.QualifiedName;
import java.util.List;
import java.util.Map;
import static com.google.common.util.concurrent.Futures.immediateVoidFuture;
import static io.trino.metadata.MetadataUtil.createQualifiedObjectName;
import static io.trino.spi.StandardErrorCode.COLUMN_NOT_FOUND;
import static io.trino.spi.StandardErrorCode.MISSING_TABLE;
import static io.trino.spi.StandardErrorCode.NOT_SUPPORTED;
import static io.trino.spi.StandardErrorCode.TABLE_NOT_FOUND;
import static io.trino.sql.analyzer.SemanticExceptions.semanticException;
import static java.util.Objects.requireNonNull;
public class CommentTask
implements DataDefinitionTask
{
private final Metadata metadata;
private final AccessControl accessControl;
@Inject
public CommentTask(Metadata metadata, AccessControl accessControl)
{
this.metadata = requireNonNull(metadata, "metadata is null");
this.accessControl = requireNonNull(accessControl, "accessControl is null");
}
@Override
public String getName()
{
return "COMMENT";
}
@Override
public ListenableFuture execute(
Comment statement,
QueryStateMachine stateMachine,
List parameters,
WarningCollector warningCollector)
{
Session session = stateMachine.getSession();
if (statement.getType() == Comment.Type.TABLE) {
commentOnTable(statement, session);
}
else if (statement.getType() == Comment.Type.VIEW) {
commentOnView(statement, session);
}
else if (statement.getType() == Comment.Type.COLUMN) {
commentOnColumn(statement, session);
}
else {
throw semanticException(NOT_SUPPORTED, statement, "Unsupported comment type: %s", statement.getType());
}
return immediateVoidFuture();
}
private void commentOnTable(Comment statement, Session session)
{
QualifiedObjectName originalTableName = createQualifiedObjectName(session, statement, statement.getName());
if (metadata.isMaterializedView(session, originalTableName)) {
throw semanticException(
TABLE_NOT_FOUND,
statement,
"Table '%s' does not exist, but a materialized view with that name exists. Setting comments on materialized views is unsupported.", originalTableName);
}
if (metadata.isView(session, originalTableName)) {
throw semanticException(
TABLE_NOT_FOUND,
statement,
"Table '%1$s' does not exist, but a view with that name exists. Did you mean COMMENT ON VIEW %1$s IS ...?", originalTableName);
}
RedirectionAwareTableHandle redirectionAwareTableHandle = metadata.getRedirectionAwareTableHandle(session, originalTableName);
if (redirectionAwareTableHandle.tableHandle().isEmpty()) {
throw semanticException(TABLE_NOT_FOUND, statement, "Table does not exist: %s", originalTableName);
}
accessControl.checkCanSetTableComment(session.toSecurityContext(), redirectionAwareTableHandle.redirectedTableName().orElse(originalTableName));
TableHandle tableHandle = redirectionAwareTableHandle.tableHandle().get();
metadata.setTableComment(session, tableHandle, statement.getComment());
}
private void commentOnView(Comment statement, Session session)
{
QualifiedObjectName viewName = createQualifiedObjectName(session, statement, statement.getName());
if (metadata.getView(session, viewName).isEmpty()) {
String additionalInformation;
if (metadata.getMaterializedView(session, viewName).isPresent()) {
additionalInformation = ", but a materialized view with that name exists. Setting comments on materialized views is unsupported.";
}
else if (metadata.getTableHandle(session, viewName).isPresent()) {
additionalInformation = ", but a table with that name exists. Did you mean COMMENT ON TABLE " + viewName + " IS ...?";
}
else {
additionalInformation = "";
}
throw semanticException(TABLE_NOT_FOUND, statement, "View '%s' does not exist%s", viewName, additionalInformation);
}
accessControl.checkCanSetViewComment(session.toSecurityContext(), viewName);
metadata.setViewComment(session, viewName, statement.getComment());
}
private void commentOnColumn(Comment statement, Session session)
{
QualifiedName prefix = statement.getName().getPrefix()
.orElseThrow(() -> semanticException(MISSING_TABLE, statement, "Table must be specified"));
QualifiedObjectName originalObjectName = createQualifiedObjectName(session, statement, prefix);
if (metadata.isView(session, originalObjectName)) {
ViewDefinition viewDefinition = metadata.getView(session, originalObjectName).get();
ViewColumn viewColumn = findAndCheckViewColumn(statement, session, viewDefinition, originalObjectName);
metadata.setViewColumnComment(session, originalObjectName, viewColumn.getName(), statement.getComment());
}
else if (metadata.isMaterializedView(session, originalObjectName)) {
MaterializedViewDefinition materializedViewDefinition = metadata.getMaterializedView(session, originalObjectName).get();
ViewColumn viewColumn = findAndCheckViewColumn(statement, session, materializedViewDefinition, originalObjectName);
metadata.setMaterializedViewColumnComment(session, originalObjectName, viewColumn.getName(), statement.getComment());
}
else {
RedirectionAwareTableHandle redirectionAwareTableHandle = metadata.getRedirectionAwareTableHandle(session, originalObjectName);
if (redirectionAwareTableHandle.tableHandle().isEmpty()) {
throw semanticException(TABLE_NOT_FOUND, statement, "Table does not exist: %s", originalObjectName);
}
TableHandle tableHandle = redirectionAwareTableHandle.tableHandle().get();
String columnName = statement.getName().getSuffix();
Map columnHandles = metadata.getColumnHandles(session, tableHandle);
if (!columnHandles.containsKey(columnName)) {
throw semanticException(COLUMN_NOT_FOUND, statement, "Column does not exist: %s", columnName);
}
accessControl.checkCanSetColumnComment(session.toSecurityContext(), redirectionAwareTableHandle.redirectedTableName().orElse(originalObjectName));
metadata.setColumnComment(session, tableHandle, columnHandles.get(columnName), statement.getComment());
}
}
private ViewColumn findAndCheckViewColumn(Comment statement, Session session, ViewDefinition viewDefinition, QualifiedObjectName originalObjectName)
{
String columnName = statement.getName().getSuffix();
ViewColumn viewColumn = viewDefinition.getColumns().stream()
.filter(column -> column.getName().equals(columnName))
.findAny()
.orElseThrow(() -> semanticException(COLUMN_NOT_FOUND, statement, "Column does not exist: %s", columnName));
accessControl.checkCanSetColumnComment(session.toSecurityContext(), originalObjectName);
return viewColumn;
}
}
