you can query by checksum but then need to confirm that returned value is of expected type. If checksum_type would be directly part of the query this additional step wouldn't be needed.
checksum
checksum_type
PR #3228
Metadata Update from @tkopecek: - Custom field Size adjusted to None
Metadata Update from @tkopecek: - Issue set to the milestone: 1.28
Metadata Update from @jcupova: - Issue tagged with: testing-ready
Commit db6931b7 fixes this issue
Commit 66a94f04 relates to this ticket
Metadata Update from @jobrauer: - Issue tagged with: testing-done
This issue has been migrated to Fedora Forge: https://forge.fedoraproject.org/koji/koji/issues/3227
Please continue any further discussion there.