[BUGS] BUG #14632: Plus and minus operators inconsistency with leap yearsand year intervals.

The following bug has been logged on the website:

Bug reference:      14632
Logged by:          Pietro Pugni
Email address:      pietro.pugni@gmail.com
PostgreSQL version: 9.6.2
Operating system:   Ubuntu 16.04.2 LTS
Description:

The following query:SELECT '1912-02-29'::date + '10 years'::interval

returns:'1922-02-28 00:00:00'

while the reverse operation:SELECT '1922-02-28'::date - '10 years'::interval

returns:'1912-02-28 00:00:00'

instead of '1912-02-29 00:00:00'.




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