| /* |
| * 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. |
| */ |
| /** |
| * Logical (execution-engine-independent) element definitions. |
| * |
| * Drill has several representations of a query including SQL, logical plans and |
| * physical plans. All of the logical constructs of Drill are separated from |
| * their physical implementations in the Java execution engine. The components |
| * of this package can be used to share common logical constructs between the |
| * current engine and any other future alternative physical implementations of |
| * the same logical constructs. This is the same for the logical expression |
| * constructs defined within this package. |
| * |
| */ |
| package org.apache.drill.common; |
