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()?
On 07/24/2011 08:18 PM, Mathieu Dubois wrote:
> I have a column of type bytea which contains a vector encoded in a
> string (elements are separated by spaces).
> The problem is that it uses a lot of storage space.
> I would like to convert this column to an ARRAY column with ALTER
> COLUMN TYPE.
> If I understand correctly, I have to specify a function to cast bytea
> to double precision. Is it correct?
> If this is correct, how to do that?
> I use regexp_split_to_array to transform the bytea to a text but I
> can't figure out how to convert it to double precision.
> I'm using postgres 8.4.
> Any idea?
> Thanks in advance,
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