UNNEST result order vs Array data

From: gmb <gmbouwer(at)gmail(dot)com>
To: pgsql-sql(at)postgresql(dot)org
Subject: UNNEST result order vs Array data
Date: 2013-06-20 10:40:57
Message-ID: 1371724857304-5760087.post@n5.nabble.com
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Hi all
I just want to confirm something regarding UNNEST function used with arrays.
I cannot see that it is specifically mentioned in the documentation , but
maybe because it is obvious.

Is the order of the result guaranteed to be the order of the array

I.e. is it possible that:
SELECT UNNEST( ARRAY[1,2,3] )

will sometimes return:
unnest
--------
2
1
3
(3 rows)

instead of:
unnest
--------
1
2
3
(3 rows)

Help will be appreciated

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