While testing the update from 7.14 to 7.15 (as suggested by David ;-) I found that one of my sites which uses a postgresql DB fails to upgrade.
The error is:
$ drush updb
The following updates are pending:
system module :
7074 - Convert menu_links query strings to arrays.
Do you wish to run all pending updates? (y/n): y
SQLSTATE: Undefined function: 7 ERROR: operator does not exist: bytea ~~* unknown [error]
LINE 4: WHERE (options ILIKE '%query%')
HINT: No operator matches the given name and argument type(s). You might need to add explicit type casts.