proposal: function parse_ident

Hi

I miss a functionality that helps with parsing any identifier to basic
three parts - database, schema, objectname. We have this function
internally, but it is not available for SQL layer.

FUNCTION parse_ident(IN ident text, OUT dbname text, OUT schemaname text,
OUT objectname text)

Examples:

SELECT parse_ident('"some schema".tablename');

Comments, ideas, notes?

Regards

Pavel