December 2017
Beginner to intermediate
500 pages
12h 10m
English
book
Learning Pentaho Data Integration 8 CE - Third Edition
by Dan Keeley, Diethard Steiner, María Carina Roldán, Miguel Gaspar, Pablo Castagnaro, Paula Clemente, Paulo Alexandre de Oliveira Rodrigues Pires
Content preview from Learning Pentaho Data Integration 8 CE - Third Edition
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Understanding the PDI rowset
Transformation deal with datasets or rowsets, that is, rows of data with a predefined metadata. The metadata tells us about the structure of data, that is, the list of fields as well as their definitions. The following table describes the metadata of a PDI dataset:
|
Metadata Element |
Description |
|
Field name |
Name of the field; it can be any (not null) text |
|
Type |
One of the supported types, as, for example, String or Integer |
|
Length |
Length of the field |
|
Precision |
Applicable for numeric fields |
|
Position |
Position of the field relative to the other fields, starting at 1 |
These metadata concepts shouldn't be new to you. Let's look at some examples:
- Recall the Hello World Transformation. ...
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