schemas/functions.sql: _map(): Fixed bug where entries that map to NULL were incorrectly being treated as if the entry didn't exist. Note that -> returns NULL both if the entry's value is NULL and if the entry doesn't exist, so ? must be used to recheck the presence of the key in the hstore.
schemas/functions.sql: _map(): Fixed bug where entries that map to NULL were incorrectly being treated as if the entry didn't exist. Note that -> returns NULL both if the entry's value is NULL and if the entry doesn't exist, so ? must be used to recheck the presence of the key in the hstore.