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When data is imported :

Supported data types from the source are converted to data types supported by the application.
Types that are not supported but are recognized by the application are converted to String types.
Types that cannot be read from the source due to technical reasons are converted to null values on import.

Tip: If you are having trouble getting your imported dataset to map to expected data types, you can disable type inference for the individual dataset. For more information, see Import Data Page.

On export, unmapped types are converted to the equivalent of strings.

Tip: You can import a target schema to assist in lining up your columns with the expected target. For more information, see Overview of RapidTarget.