| //// |
| 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 |
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| //// |
| :documentationPath: /plugins/transforms/ |
| :language: en_US |
| :page-alternativeEditUrl: https://github.com/apache/incubator-hop/edit/master/plugins/transforms/append/src/main/doc/append.adoc |
| = Append Streams |
| |
| == Description |
| |
| The "Append streams" transform reads the data from two transforms, only processing the second stream after the first is finished. |
| As always, the row layout for the input data coming from both transforms has to be identical: the same row lengths, the same data types, the same fields at the same field indexes in the row. |
| |
| *Important*: If you don't care about the order in which the output rows occur, you can use any transform to create a union of 2 or more data streams. |
| |
| |
| == Options |
| |
| [width="90%", options="header"] |
| |=== |
| |Option|Description |
| |Transform name|Name of the transform. Note: This name has to be unique in a single pipeline. |
| |Head hop|The name of the transform from which will be read from first. |
| |Tail hop|The name of the transform from which will be read from last. |
| |=== |
| |
| == Metadata Injection Support |
| |
| All fields of this transform support metadata injection. |
