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SPICE does not partition the data. It simply loads the data from all the files listed in the manifest into a single table. This is why there is a requirement that the data types for every field have to be the same in all files listed in the manifest.
You can read more about this here https://docs.aws.amazon.com/quicksight/latest/user/data-sets-based-on-multiple-s3-files.html
If you want to leverage partitions on S3, you can use Athena to query the data set on S3 before it gets imported into SPICE. Using Athena with QuickSight allows you to load a complete table from Athena or write a custom SQL query to load. With a custom SQL query, you can leverage your Athena partitions at query time, prior to having the result set loaded into SPICE.
https://docs.aws.amazon.com/quicksight/latest/user/create-a-data-set-athena.html
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