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Try the following:
-Set the transformation rule for the target column as "add-column" in the mapping rules JSON file. Specify the data type, length and expression to populate the column values. -When creating the DMS task, set the parameter "add_column_name" to true. This will include the column names in the migrated data. -The column values will be populated as per the expression defined in the transformation rule during the migration. -You can then load this data from S3 to another database or use it for other purposes.
Also: -Check that the RDS user has necessary privileges to add a column. -Make sure the column data type and length specified in the rule matches the target.
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