Simon Riggs wrote
> postgres=# select * from unnest(ARRAY[1,2,3]) with ordinality;
>
> unnest | ordinality
> --------+------------
> 1 | 1
> 2 | 2
> 3 | 3
>
> postgres=# select unnest(ARRAY[1,2,3]) with ordinality;
>
> ERROR: syntax error at or near "ordinality"
> LINE 1: select unnest(ARRAY[1,2,3]) with ordinality;
>
> though this works
>
> postgres=# select unnest(ARRAY[1,2,3]);
>
> unnest
> --------
> 1
> 2
> 3
>
> The manual
> http://www.postgresql.org/docs/devel/static/queries-table-expressions.html#QUERIES-TABLEFUNCTIONS
> says
> "Columns returned by table functions can be included in SELECT, JOIN,
> or WHERE clauses in the same manner as columns of a table, view, or
> subquery."
> There is no qualification of that for WITH ORDINALITY, nor an example
A function used in the select-list of a query does not constitute a "table
expression" and so is not covered by this particular section of the
documentation.
From your link:
"Table functions are functions that produce a set of rows [...]. They are
used like a table, view, or subquery in the FROM clause of a query."
So even if the documentation could be improved altering this section to deal
with select-list invocations of set-returning functions seems like an
overkill and verbose solution.
David J.
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