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This error is to be expected when there are null values in the data since it seems like Redshift does not allow to write values with NullType. Some suggestions to avoid this error are -
- Remove the rows containing null values using Spark SQL by converting glue dynamic frame to spark dataframe and then deleting rows with null values.
- Use DropNullFields option in Glue - https://docs.aws.amazon.com/glue/latest/dg/aws-glue-api-crawler-pyspark-transforms-DropNullFields.html
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