SQL Error [0A000]: ERROR: OVER is not supported for ordered-set aggregate percentile_cont

Hi,

I have a query like this:

*select date_trunc('minute',created) as
created,hostname,substring(datadir,0,15) as data_partition, query,sum(size)
as disk_usage*
*from gp_wf_per_query a*
*JOIN gp_segment_configuration c ON a.segid = c.content*
*where datadir like '%primary%'*
*group by query, hostname,
substring(datadir,0,15),date_trunc('minute',created)*
*order by date_trunc('minute',created) desc,hostname desc,
substring(datadir,0,15) asc;*

and I'm getting an error:
*SQL Error [0A000]: ERROR: OVER is not supported for ordered-set aggregate
percentile_cont*

Here's a create table statement and some sample data to reproduce the error:

CREATE TABLE initial (
created timestamp without time zone ,
hostname text ,
data_partition text ,
query text ,
disk_usage numeric
);

I attach some sample data to load the table