> For the complete documentation index, see [llms.txt](https://docs.pentaho.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.pentaho.com/pdia-data-integration/10.2-data-integration/pdi-transformation-steps-reference-overview/hadoop-file-output-cp-main-page/options-hadoop-file-output-reuse/fields-tab-hadoop-file-output-reuse.md).

# Fields tab

The **Fields** tab is where you define properties for the fields being exported. The following table describes each field:

| Field         | Description                                                                                                                                                                                                                                                                                                                                                                 |
| ------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Name**      | The name of the field                                                                                                                                                                                                                                                                                                                                                       |
| **Type**      | Type of the field can be either **String**, **Date** or **Number**.                                                                                                                                                                                                                                                                                                         |
| **Format**    | An optional mask for converting the format of the original field.                                                                                                                                                                                                                                                                                                           |
| **Length**    | <p>The length of the field depends on the following field types:</p><ul><li><strong>Number</strong></li></ul><p>Total number of significant figures in a number.</p><ul><li><strong>String</strong></li></ul><p>Total length of string.</p><ul><li><strong>Date</strong></li></ul><p>Length of printed output of the string (for example, four is a length for a year).</p> |
| **Precision** | Number of floating point digits for number-type fields.                                                                                                                                                                                                                                                                                                                     |
| **Currency**  | Symbol used to represent currencies (`$5,000.00` or `€5.000,00` for example).                                                                                                                                                                                                                                                                                               |
| **Decimal**   | A decimal point can be a period (`.`) as in `10,000.00` or it can be a comma (`,`) as in `5.000,00`.                                                                                                                                                                                                                                                                        |
| **Group**     | A grouping can be a comma (`,`) as in `10,000.00` or it can be a period (`.`) as in `5.000,00`.                                                                                                                                                                                                                                                                             |
| **Trim Type** | The trimming method to apply to a string. Trimming only works when no field length is specified.                                                                                                                                                                                                                                                                            |
| **Null**      | If the value of the field is null, the specified string is inserted into the output text file.                                                                                                                                                                                                                                                                              |


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