[BUGS] BUG #14717: NULL=NULL is true for composite types

The following bug has been logged on the website:

Bug reference:      14717
Logged by:          Paolo Guagliardo
Email address:      paolo.guagliardo@ed.ac.uk
PostgreSQL version: 9.6.3
Operating system:   Scientific Linux release 7.3 (Nitrogen)
Description:

Comparisons between row types with NULLs behave as expected:

SELECT (1,NULL) = (1,NULL);
?column? 
----------
(1 row)

However, if we now create a composite type:

CREATE TYPE pair AS (a int, b int);

then we get

SELECT (1,NULL)::pair = (1,NULL)::pair ;
?column? 
----------t
(1 row)

while the answer should be NULL (unknown) as before.

Other operations (<>,>,<,>=,<=) are affected as well.


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