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I made exactly such a SQL table function called IMAGE_CATALOG_DETAILS as open source back in 2016.
The source is available in a BitBucket repository: https://bitbucket.org/christianjorgensen/sql-udtf-image_catalog_details/src/master/
Building the table function requires the ILE RPG compiler, but it can run on IBM i 7.1 and newer releases.
It works for both optical and tape image catalogs, and we have used it since creation without any issues.
HTH.
Best regards,
Christian
CEAC member
Db2 for i development team
IBM Power Systems Development