In vandelay.flatten_marc_hstore there are a couple
instances of set-returning functions used inside a
CASE statement, which Pg10 is unhappy about. This
branch changes these regexp_matches calls to use
regexp_match instead which avoids this error.
Signed-off-by: Jason Boyer <jboyer@library.in.gov> Signed-off-by: Jason Stephenson <jason@sigio.com> Signed-off-by: Ben Shum <ben@evergreener.net> Signed-off-by: Jason Boyer <jboyer@library.in.gov>