[11.x] Add ability to create raw unique indexes for postgresql #54254
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This PR adds a way for people to create unique keys on postgres with a value of
LOWER(column)
(or any other transformative sql function) into their unique key.Example of an index statement this would now allow:
create unique index "username_unique" on "users" (LOWER(username))
This feature is fully backwards compatible since it is only enabled upon a function call and as such can be merged in 11.x.
Let me know if you require any changes!
(Also let me know if you want me to re-target this on master for 12.x instead)