Re: BUG #5831: Splitting string into char array with string_to_array does not work

The following bug has been logged online:

Bug reference: 5831
Logged by: Splitting string into char array with string_to_array
Email address: valgog(at)gmail(dot)com
PostgreSQL version: 9.0.1
Operating system: Ubuntu/Linaro 4.4.4-14ubuntu5
Description: Splitting string into char array with string_to_array
does not work
Details:

Hi,

I cannot really remember now for sure, but the splitting string into array
using an empty string ('') worked for me on pre-9.0 versions to get array of
string chars. Now I have the following behavior:

postgres=# select string_to_array('ab', '' ),
regexp_split_to_array('ab', '' );
string_to_array │ regexp_split_to_array

─────────────────┼───────
───────────────
{ab} │ {a,b}
(1 row)

Why an empty string given as a separator to string_to_array is not splitting
the string at all?

"Splitting string into char array with string_to_array" <valgog(at)gmail(dot)com> writes:
> I cannot really remember now for sure, but the splitting string into array
> using an empty string ('') worked for me on pre-9.0 versions to get array of
> string chars.

Really? I get this in all versions since 7.4, where string_to_array was
introduced:

regression=# select string_to_array('ab', '' );
string_to_array
-----------------
{ab}
(1 row)

regards, tom lane

2011/1/11 Splitting string into char array with string_to_array
<valgog(at)gmail(dot)com>:
>
> The following bug has been logged online:
>
> Bug reference:      5831
> Logged by:          Splitting string into char array with string_to_array
> Email address:      valgog(at)gmail(dot)com
> PostgreSQL version: 9.0.1
> Operating system:   Ubuntu/Linaro 4.4.4-14ubuntu5
> Description:        Splitting string into char array with string_to_array
> does not work
> Details:
>
> Hi,
>
> I cannot really remember now for sure, but the splitting string into array
> using an empty string ('') worked for me on pre-9.0 versions to get array of
> string chars. Now I have the following behavior:

Hello

it's newer worked like you remember

postgres=# select regexp_split_to_array('abc','');
regexp_split_to_array
-----------------------
{a,b,c}
(1 row)

Regards

Pavel Stehule

>
>    postgres=# select string_to_array('ab', '' ),
> regexp_split_to_array('ab', '' );
>     string_to_array │ regexp_split_to_array
>
> ─────────────────┼───────â
> ��───────────────
>     {ab}            │ {a,b}
>    (1 row)
>
> Why an empty string given as a separator to string_to_array is not splitting
> the string at all?
>
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