From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
---|---|
To: | YUriy Zhuravlev <u(dot)zhuravlev(at)postgrespro(dot)ru> |
Cc: | "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Some questions about the array. |
Date: | 2015-10-12 22:53:43 |
Message-ID: | CA+TgmoadZKV2r0ecANk_9rvbq8q7Gi2kUog0GA5HM3hA2-M_Qg@mail.gmail.com |
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On Fri, Oct 9, 2015 at 8:02 AM, YUriy Zhuravlev
<u(dot)zhuravlev(at)postgrespro(dot)ru> wrote:
> We were some of the issues associated with the behavior of arrays.
> 1. We would like to implement arrays negative indices (from the end) like in
> Python or Ruby: arr[-2] or arr[1: -1]
> but as an array can be indexed in the negative area so it probably can not be
> done.
That seems like a complete non-starter because it would break backward
compatibility. Our array implementation allows negative indexes:
rhaas=# select ('[-1:4]={3,1,4,1,5,9}'::int[])[-1];
int4
------
3
(1 row)
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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