Two routines do eccentric things when they can't find required supporting
data:
pg_get_userbyid
returns 'unknown (UID=<uid-number>)' when the UID does not exist.
pg_get_viewdef
returns 'Not a view' when passed a non-existant or non-view table
it also signals errors when the underlying metadata can not be found.
The proposal is to return NULL in the above cases - in the final case,
probably also generate a NOTICE.
Does anybody have a problem with this? Think it's a bad idea etc?
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