I'm working on a foreign data wrapper and I want to switch based on the
column type. Specifically, if the column type in the external table is the
same as in the (locally defined) foreign table then I can get some speedup
for some types.
Through the ForeignScanState object I can get TupleDesc and AttInMetadata
opjects, and through there I can get the Oid of the column type, but now
I'm stumped. How can I programmatically check whether Oid X refers to type
int4, or whatever?
Thanks.