You can edit field data types to customize the precision and data types of fields. You can edit the field metadata in a Source transformation to change simple data types and precision.
To edit metadata, use the Edit Metadata option for the source fields on the Fields tab of the Properties panel.
Rules and guidelines
•When you read values of integer, double, bigint, and boolean data types in a mapping, you cannot edit the precision. You can edit the precision only when you create a mapping task.
•When you read values of string data type in a mapping and edit the precision, the mapping does not consider the change in the precision. You can edit the precision when you create a mapping task.