| //// |
| 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 |
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| //// |
| :documentationPath: /plugins/transforms/ |
| :language: en_US |
| :page-alternativeEditUrl: https://github.com/apache/incubator-hop/edit/master/plugins/transforms/mergejoin/src/main/doc/mergejoin.adoc |
| = Merge Join |
| |
| == Description |
| |
| The Merge Join transform performs a classic merge join between data sets with data coming from two different input transforms. Join options include INNER, LEFT OUTER, RIGHT OUTER, and FULL OUTER. |
| |
| == Options |
| |
| [width="90%", options="header"] |
| |=== |
| |Option|Description |
| |Commit size|The number of rows to change (insert / update) before running a commit. |
| |Connection|The database connection to which data is written. |
| |Don't perform any updates|If enabled, the values in the database are never updated;only inserts are performed. |
| |Key Lookup table|Allows you to specify a list of field values and comparators. You can use the following comparators: =, = ~NULL, <>, <, <=, >, >=, LIKE, BETWEEN, IS NULL, IS NOT NULL |
| |SQL button|Click SQL to generate the SQL to create the table and indexes for correct operation. |
| |Transform name|Name of the transform; this name has to be unique in a single pipeline. |
| |Target schema|The name of the Schema for the table to which data is written. This is important for data sources that allow for table names with periods in them. |
| |Target table|Name of the table in which you want to do the insert or update. |
| |Update Fields|Allows you to specify all fields in the table you want to insert/update including the keys. Avoid updates on certain fields by specifying N in the update column. |
| |=== |
| |
| == Metadata Injection Support |
| |
| All fields of this transform support metadata injection. You can use this transform with Metadata Injection to pass metadata to your pipeline at runtime. |