Log Message:
-----------
Fix information schema views to return NULL for precision and scale of
an unconstrained numeric column. Also, factor out some duplicate code
into functions, to ease future maintenance.
Modified Files:
--------------
pgsql-server/src/backend/catalog:
information_schema.sql (r1.23 -> r1.24)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/catalog/information_schema.sql.diff?r1=1.23&r2=1.24)