[BUGS] BUG #14479: Casting non-constant values to INTERVAL DAY TO MINUTEdoesn't truncate the seconds field

The following bug has been logged on the website:

Bug reference:      14479
Logged by:          Piotr Stefaniak
Email address:      email@piotr-stefaniak.me
PostgreSQL version: 9.4.10
Operating system:   FreeBSD, probably irrelevant
Description:

# SELECT x.y::INTERVAL DAY TO MINUTE, (interval '02:47:15.375721')::INTERVAL
DAY TO MINUTE FROM (VALUES (interval '02:47:15.375721')) x (y);
        y        | interval 
-----------------+----------
 02:47:15.375721 | 02:47:00

I chose 9.4.10 as the version in the web form because that's what I have,
but Andrew Gierth has said that this is the behavior of versions: 9.2, 9.3,
and 9.4 but not versions 9.1, 9.5, and HEAD.


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