| /* |
| * 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.drill.exec.planner.sql.handlers; |
| |
| import org.apache.calcite.sql.SqlLiteral; |
| import org.apache.calcite.sql.SqlNode; |
| import org.apache.commons.lang3.StringUtils; |
| import org.apache.drill.common.exceptions.UserException; |
| import org.apache.drill.common.expression.SchemaPath; |
| import org.apache.drill.exec.alias.AliasRegistry; |
| import org.apache.drill.exec.alias.Aliases; |
| import org.apache.drill.exec.physical.PhysicalPlan; |
| import org.apache.drill.exec.planner.sql.DirectPlan; |
| import org.apache.drill.exec.planner.sql.parser.SqlDropAlias; |
| import org.apache.drill.exec.work.foreman.ForemanSetupException; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.IOException; |
| import java.util.Locale; |
| |
| /** |
| * Handler for handling DROP ALIAS statements. |
| */ |
| public class DropAliasHandler extends BaseAliasHandler { |
| |
| private static final Logger logger = LoggerFactory.getLogger(DropAliasHandler.class); |
| |
| public DropAliasHandler(SqlHandlerConfig config) { |
| super(config); |
| } |
| |
| @Override |
| public PhysicalPlan getPlan(SqlNode sqlNode) throws ForemanSetupException, IOException { |
| checkAliasesEnabled(); |
| |
| SqlDropAlias node = unwrap(sqlNode, SqlDropAlias.class); |
| String alias = SchemaPath.getCompoundPath(node.getAlias().names.toArray(new String[0])).toExpr(); |
| |
| String aliasTarget = ((SqlLiteral) node.getAliasKind()).toValue(); |
| AliasRegistry aliasRegistry = getAliasRegistry(aliasTarget); |
| |
| Aliases aliases = getAliases(node, aliasRegistry); |
| boolean checkIfExists = ((SqlLiteral) node.getIfExists()).booleanValue(); |
| boolean removed = aliases.remove(alias); |
| if (!removed && !checkIfExists) { |
| throw UserException.validationError() |
| .message("No alias found with given name [%s]", alias) |
| .build(logger); |
| } |
| String message = removed |
| ? String.format("%s alias '%s' dropped successfully", StringUtils.capitalize(aliasTarget.toLowerCase(Locale.ROOT)), alias) |
| : String.format("No %s alias found with given name [%s]", aliasTarget.toLowerCase(Locale.ROOT), alias); |
| return DirectPlan.createDirectPlan(context, removed, message); |
| } |
| |
| private Aliases getAliases(SqlDropAlias dropAlias, AliasRegistry aliasRegistry) { |
| boolean isPublicAlias = ((SqlLiteral) dropAlias.getIsPublic()).booleanValue(); |
| return isPublicAlias |
| ? getPublicAliases(dropAlias, aliasRegistry) |
| : getUserAliases(dropAlias, aliasRegistry); |
| } |
| |
| private Aliases getUserAliases(SqlDropAlias dropAlias, AliasRegistry aliasRegistry) { |
| if (!context.isImpersonationEnabled()) { |
| throw UserException.validationError() |
| .message("Cannot drop user alias when user impersonation is disabled") |
| .build(logger); |
| } |
| String userName = resolveUserName(dropAlias.getUser()); |
| return aliasRegistry.getUserAliases(userName); |
| } |
| |
| private Aliases getPublicAliases(SqlDropAlias dropAlias, AliasRegistry aliasRegistry) { |
| if (dropAlias.getUser() != null) { |
| throw UserException.validationError() |
| .message("Cannot drop public alias for specific user") |
| .build(logger); |
| } |
| checkAdminPrivileges(context.getOptions()); |
| return aliasRegistry.getPublicAliases(); |
| } |
| } |