Re: Aggregate Push Down - Performing aggregation on foreign server

On Mon, Sep 12, 2016 at 12:20 PM, Prabhat Sahu <
prabhat(dot)sahu(at)enterprisedb(dot)com> wrote:

> Hi,
>
> While testing "Aggregate pushdown", i found the below error:
> -- GROUP BY alias showing different behavior after adding patch.
>
> -- Create table "t1", insert few records.
> create table t1(c1 int);
> insert into t1 values(10), (20);
>
> -- Create foreign table:
> create foreign table f_t1 (c1 int) server db1_server options (table_name
> 't1');
>
> -- with local table:
> postgres=# select 2 a, avg(c1) from t1 group by a;
> a | avg
> ---+---------------------
> 2 | 15.0000000000000000
> (1 row)
>
> -- with foreign table:
> postgres=# select 2 a, avg(c1) from f_t1 group by a;
> ERROR: aggregate functions are not allowed in GROUP BY
> CONTEXT: Remote SQL command: EXPLAIN SELECT 2, avg(c1) FROM public.t1
> GROUP BY 2
>
>
>
Thanks for reporting this bug in *v1.patch Prabhat.

I will have a look over this issue and will post a fix in next version.

Thanks
--
Jeevan B Chalke
Principal Software Engineer, Product Development
EnterpriseDB Corporation
The Enterprise PostgreSQL Company