Re: syntax error WITH ORDINALITY

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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