From the menu bar, click Window > Preferences to open the [Preferences] dialog box.
Expand the Talend node, and click Specific Settings > Default Type and Length to display the data length and type of your schema.
Set the parameters according to your needs:
In the Default Settings for Fields with Null Values area, fill in the data type and the field length to apply to the null fields.
In the Default Settings for All Fields area, fill in the data type and the field length to apply to all fields of the schema.
In the Default Length for Data Type area, fill in the field length for each type of data.