Re: array support patch phase 1 patch

Joe Conway wrote:
> Tom Lane wrote:
>> I've applied much but not all of this. Some comments:
>
> Here (finally!) is a doc patch to go with the previously applied array
> support changes. If there are no objections, please apply.

Attached is an updated version of the doc patch along with the addition
of two new functions, as previously discussed:

- str_to_array(str TEXT, delim TEXT) returns TEXT[]
- array_to_str(array ANYARRAY, delim TEXT) returns TEXT

The patch is fairly large because:

1. the documentation part of it is large
2. I moved some static functions around and made them accessible so
that I could use them in implementing the two functions.

It passes all regression tests, and as mentioned above includes
documentation.

If there are no objections, please apply.

Thanks,

Joe