| /** |
| * 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. |
| */ |
| /** |
| * <p> |
| * Provides read and write support for ORC files. Tajo schemas are |
| * converted to ORC struct type |
| * </p> |
| * |
| * <table> |
| * <tr> |
| * <th>Tajo type</th> |
| * <th>ORC type</th> |
| * </tr> |
| * <tr> |
| * <td>NULL_TYPE</td> |
| * <td>BOOLEAN, but all fields are marked as null</td> |
| * </tr> |
| * <tr> |
| * <td>BOOLEAN</td> |
| * <td>BOOLEAN</td> |
| * </tr> |
| * <tr> |
| * <td>BYTE</td> |
| * <td>BYTE</td> |
| * </tr> |
| * <tr> |
| * <td>INT2</td> |
| * <td>SHORT</td> |
| * </tr> |
| * <tr> |
| * <td>INT4</td> |
| * <td>INTEGER</td> |
| * </tr> |
| * <tr> |
| * <td>INT8</td> |
| * <td>LONG</td> |
| * </tr> |
| * <tr> |
| * <td>FLOAT4</td> |
| * <td>FLOAT</td> |
| * </tr> |
| * <tr> |
| * <td>FLOAT8</td> |
| * <td>DOUBLE</td> |
| * </tr> |
| * <tr> |
| * <td>CHAR/TEXT</td> |
| * <td>STRING</td> |
| * </tr> |
| * <tr> |
| * <td>BLOB/PROTOBUF</td> |
| * <td>BINARY</td> |
| * </tr> |
| * <tr> |
| * <td>TIMESTAMP</td> |
| * <td>TIMESTAMP</td> |
| * </tr> |
| * <tr> |
| * <td>DATE</td> |
| * <td>DATE</td> |
| * </tr> |
| * </table> |
| * |
| * <p> |
| * Because Tajo fields can be NULL, all ORC fields are marked as optional. |
| * </p> |
| * |
| * <p> |
| * The conversion from Tajo to ORC is lossy without the original Tajo |
| * schema. As a result, ORC files are read using the Tajo schema saved in |
| * the Tajo catalog for the table the ORC files belong to, which was |
| * defined when the table was created. |
| * </p> |
| */ |
| |
| package org.apache.tajo.storage.orc; |
