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Extension parameter is a feature released recently and it's available after version 1.0.45698. You are seeing this error since your cluster version 1.0.44903 is lower than this. Please wait until next maintenance window or try creating a new cluster/workgroup to get the updated version.
Cluster versions and released features are documented in following page. https://docs.aws.amazon.com/redshift/latest/mgmt/cluster-versions.html#cluster-version-173
Adds a file extension parameter to the UNLOAD command, so file extensions are automatically added to filenames.
Also, UNLOAD will add a period between filename and extension automatically. So you don't need to specify .
by yourself (ex: extension '.csv.gz'
-> extension 'csv.gz'
).
answered a year ago
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Understood. I can see maintenance is scheduled 3 days from now so I will wait and try again. Thanks for the answer.