# Enter Mapping window

![Enter Mapping window](/files/Ccf0msgTSsSHQ88PK3Ba)

| Field                            | Description                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| -------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Source fields**                | The list of field names from the incoming stream.                                                                                                                                                                                                                                                                                                                                                                                             |
| **Target fields**                | <p>The fields in the output table.When using this step with Spark on AEL, output fields types are converted for processing. For example:</p><ul><li>VarChar and Char are converted to String.</li><li>TinyInt and Smallest are converted to Integer.</li><li>BigInt is converted to BigNumber.</li></ul><p>See the <strong>Administer Pentaho Data Integration and Analytics</strong> document for a complete listing of the conversions.</p> |
| **Add** (button)                 | Click **Add** to move a selected combination of a field name and a column name to the **Mappings** pane.                                                                                                                                                                                                                                                                                                                                      |
| **Delete** (button)              | Click **Delete** to move a mapped combination from the **Mappings** pane back to the **Source fields** and **Target fields** panes.                                                                                                                                                                                                                                                                                                           |
| **Mappings**                     | The field to column mapping designating the incoming field and the table column where the field will be assigned.                                                                                                                                                                                                                                                                                                                             |
| **Auto target selection?**       | Select to have the step perform mapping to a target.                                                                                                                                                                                                                                                                                                                                                                                          |
| **Hide assigned source fields?** | Select to remove a field from the **Source fields** pane when it has been matched and moved to the**Mappings** pane.                                                                                                                                                                                                                                                                                                                          |
| **Auto source selection**        | Select to automatically select a field from the **Source fields** pane when a column name is selected.                                                                                                                                                                                                                                                                                                                                        |
| **Hide assigned target fields?** | Select to remove a field from the **Target fields** pane when it has been matched and moved to the **Mappings** pane.                                                                                                                                                                                                                                                                                                                         |
| **Guess** (button)               | Click **Guess** to perform automatic matching of all fields and population of the **Mappings** pane.                                                                                                                                                                                                                                                                                                                                          |


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