pgsql/src/include parser/parse_coerce.h catalo ...

inoue@postgresql.org writes:

Modified files:
src/include/parser: parse_coerce.h
src/include/catalog: pg_operator.h
Log message:
Allow comparison between xid and xid, int.

I do not think it's a good idea to define xid and int as
binary-compatible.  If it is a good idea then you did it wrong
--- IS_BINARY_COMPATIBLE needs to test for both directions.

But what I'd suggest is to undo the IS_BINARY_COMPATIBLE change
and instead add another pg_operator entry that accepts xid = int4,
mapping it to xideq. That gets the job done without opening up
a morass of binary-compatibility issues.

regards, tom lane