Amazon Redshift will no longer support the creation of new Python UDFs starting Patch 198. Existing Python UDFs will continue to function until June 30, 2026. For more information, see the [ blog post ](https://aws.amazon.com/blogs/big-data/amazon-redshift-python-user-defined-functions-will-reach-end-of-support-after-june-30-2026/). 

# Load data is incorrect
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Your COPY operation can load incorrect data in the following ways. We suggest the following troubleshooting approaches.

**Wrong files are loaded**  
Using an object prefix to specify data files can cause unwanted files to be read. Instead, use a manifest file to specify exactly which files to load. For more information, see the [copy_from_s3_manifest_file](copy-parameters-data-source-s3.md#copy-manifest-file) option for the COPY command and [Example: COPY from Amazon S3 using a manifest](r_COPY_command_examples.md#copy-command-examples-manifest) in the COPY examples.