Amazon Redshift data types appear in the Source and Target transformations when you choose to edit metadata for the fields.
Transformation Data Types
Set of data types that appear in the transformations. They are internal data types based on ANSI SQL-92 generic data types, which the runtime environment uses to move data across platforms. Transformation data types appear in all transformations in
tasks, mappings, and
reads source data, it converts the native data types to the comparable transformation data types before transforming the data. When
writes to a target, it converts the transformation data types to the comparable native data types.