Data Integration uses the following data types in

Microsoft Azure Synapse SQL

mappings and mapping tasks:

Microsoft Azure Synapse SQL
native 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. These are internal data types based on ANSI SQL-92 generic data types, which the Secure Agent uses to move data across platforms. They appear in all transformations in a mapping.

When the Secure Agent reads source data, it converts the native data types to the comparable transformation data types before transforming the data. When the Secure Agent writes to a target, it converts the transformation data types to the comparable native data types.