Re: WIP: Covering + unique indexes.

26.01.2018 07:19, Thomas Munro:
> On Fri, Jan 26, 2018 at 3:01 AM, Anastasia Lubennikova
> <a.lubennikova@postgrespro.ru> wrote:
>> Thanks for the reminder. Rebased patches are attached.
> This is a really cool and also difficult feature.  Thanks for working
> on it!  Here are a couple of quick comments on the documentation,
> since I noticed it doesn't build:
>
> SGML->XML change: (1) empty closing tags "</>" are no longer accepted,
> (2) <xref ...> now needs to be written <xref .../> and (3) xref IDs
> are now case-sensitive.
>
> +  PRIMARY KEY ( <replaceable
> class="parameter">column_name</replaceable> [, ... ] ) <replaceable
> class="parameter">index_parameters</replaceable> <optional>INCLUDE
> (<replaceable class="parameter">column_name</replaceable> [,
> ...])</optional> |
>
> I hadn't seen that use of "<optional>" before.  Almost everywhere else
> we use explicit [ and ] characters, but I see that there are other
> examples, and it is rendered as [ and ] in the output.  OK, cool, but
> I think there should be some extra whitespace so that it comes out as:
>
>    [ INCLUDE ... ]
>
> instead of:
>
>    [INCLUDE ...]
>
> to fit with the existing convention.
>
> +        ... This also allows <literal>UNIQUE</> indexes to be defined on
> +        one set of columns, which can include another set of columns in the
> +       <literal>INCLUDE</> clause, on which the uniqueness is not enforced.
> +        It's the same with other constraints (PRIMARY KEY and
> EXCLUDE). This can
> +        also can be used for non-unique indexes as any columns which
> are not required
> +        for the searching or ordering of records can be used in the
> +        <literal>INCLUDE</> clause, which can slightly reduce the
> size of the index.

Thank you for reviewing. All mentioned issues are fixed.

-- 
Anastasia Lubennikova
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company