Re: [BUGS] BUG #14494: Regression - Null arrays are not queryable

The following bug has been logged on the website:

Bug reference:      14494
Logged by:          Linas Vepstas
Email address:      linasvepstas@gmail.com
PostgreSQL version: 9.6.1
Operating system:   Debian unstable
Description:

Array handling appears to have regressed,

with lots of surprising results for empty
and null arrays.

test=> select * from foo where outgoing=null;
 name | outgoing
------+----------
(0 rows) 

unexpected: wanted one row here.

test=> select * from foo where outgoing != '{43,67}';
 name | outgoing
------+----------
 two  | {}
(1 row) 

unexpected: wanted two rows here. Where did the null row go?

test=> select * from foo where array_length(outgoing,1)=0 ;
 name | outgoing
------+----------
(0 rows)

Huh? there is at least one array whose length is zero, and another that
doesn't have a length...