From: Tom Lane <tgl@sss.pgh.pa.us>
To: "David G. Johnston" <david.g.johnston@gmail.com>
cc: "pgsql-docs@postgresql.org" <pgsql-docs@postgresql.org>
Subject: Re: Annoying "split to array" function inconsistency...best way to
 fix?
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Comments: In-reply-to "David G. Johnston" <david.g.johnston@gmail.com>
 message dated "Sun, 27 Sep 2015 10:49:01 -0400"
Date: Sun, 27 Sep 2015 18:54:35 -0400
Message-ID: <12249.1443394475@sss.pgh.pa.us>
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"David G. Johnston" <david.g.johnston@gmail.com> writes:
> Two functions exists that convert "text" to "text[]"
> regexp_string_to_array(text, text [,text]) :
> http://www.postgresql.org/docs/9.4/interactive/functions-string.html
> string_to_array(text, text [, text]) :
> http://www.postgresql.org/docs/9.4/interactive/functions-array.html

> Would it be hateful to make it so that both entries appear on both tables?

> array_to_string(anyarray, text [,text]) could be lumped in with this as
> well.

> string_to_array not being on the string functions page is the more glaring
> omission for me.

I am not excited about the idea of documenting functions twice; that would
almost certainly lead to the redundant entries getting out of sync.

We could possibly decide that string_to_array and array_to_string are
primarily string functions not array functions, and just move them to
the string-functions page.

Another possibility is to just add cross-references to the
string-functions page, like the existing one for string_agg().
But I think I like the first idea better, in view of
regexp_string_to_array already being here.

			regards, tom lane


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