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The generic error you are receiving (GENERIC_INTERNAL_ERROR: No enum constant org.apache.parquet.schema.OriginalType.2a) is not accurately traceable without context of the data in the file you are processing and the specific transforms that are being applied.
Please check that the entire dataset you are transforming to parquet is actually convertible to the destination column type. You could manually check the source file or you could try using the type casting functionality in Athena to convert columns to a specific type to see that it is valid.
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