https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=17234

--- Comment #56 from Jonathan Druart <[email protected]> 
---
Created attachment 58865
  -->
https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=58865&action=edit
Bug 17234: Need to separate KEY and FOREIGN KEY checks

In the previous patch we use the constraint_exists subroutine to verify
if an index or a foreign key exists.
But the `SHOW INDEX` query does not return foreign keys (as its name
suggests!).
We need another subroutine foreign_key_exists to check the FK existence.

I have found that because t/db_dependent/TestBuilder.t fails on
oai_sets_biblios, because oai_sets_biblios_ibfk_1 has not been removed.

Test plan:
0/ Do not apply this patch
1/ Use a 3.20 DB
2/ update the DB
3/ SHOW CREATE TABLE oai_sets_biblios
will display oai_sets_biblios_ibfk_1

Apply the patch and repeat 1, 2, 3
=> Will not display oai_sets_biblios_ibfk_1
It has been removed as expected.

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