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Re: cast bytea to double precision[]

From: Merlin Moncure <mmoncure(at)gmail(dot)com>
To: Mathieu Dubois <mathieu(dot)dubois(at)limsi(dot)fr>
Cc: pgsql-novice(at)postgresql(dot)org
Subject: Re: cast bytea to double precision[]
Date: 2011-07-25 15:54:33
Message-ID: CAHyXU0z9MpaW8GY9eu-Jc3ag=ndpQhfctBUwHjNEz1c=A5cPYQ@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-novice
On Sun, Jul 24, 2011 at 2:03 PM, Mathieu Dubois <mathieu(dot)dubois(at)limsi(dot)fr> wrote:
> I have found a solution by myself for the conversion:
> regexp_split_to_array(sig_vector, E',')::double precision[] (elements are in
> fact separated by commas).
>
> To convert my column I have used:
> ALTER TABLE my_table ALTER sig_vector TO double precision[] USING
> regexp_split_to_array(sig_vector, E',')::double precision[];
>
> Is that correct?
> Is it correct to pass the column name to regexp_split_to_array()?

Yeah -- you are just passing a column's data into a function as an
argument -- standard practice.  This will work -- your bytea is really
a text column, so it's just a matter of breaking up the string.
regexp_* functions are great for that.

merlin

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