| .. 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. | |
| .. Ported from the Paimon documentation: | |
| .. https://github.com/apache/paimon/blob/master/docs/content/append-table/overview.md | |
| Append Only Table | |
| ================= | |
| If a table does not have a primary key defined, it is an append table. | |
| Ordinary append writes accept ``INSERT`` rows only and do not apply upserts | |
| or deletes by key. | |
| The experimental real-time append deduplicate mode is an exception. With | |
| ``realtime.deduplicate-key-fields`` configured, it also accepts ``UPDATE_AFTER``, | |
| ``DELETE`` and ``UPDATE_BEFORE``, using deletion vectors to hide superseded | |
| rows. The table still has no primary key; deduplication is scoped to each | |
| partition-bucket. See :doc:`realtime` for the required schema, options and | |
| shared context. |