Export to parquet query doesn't return

Hi,
I run export to parquet query. The files are created as expected after a few minutes, but the query keeps running and doesn't return any answer (I've waited for hours).

_ EXPORT TO PARQUET ( directory = '/data_parquet/recvTimeDate_2020-02-20_half_hour') OVER
(partition by startMeasurementDate order by startMeasurement) AS SELECT
startMeasurement,column1,column2,column3, column4,column5,column6,column7,column8,
column9,column10,column11,column12,column13,column14,recvTime from public.table1 where
recvTime BETWEEN '2020-02-20 10:00:00' and '2020-02-20 10:30:00' ;_

Any idea what's the problem?

Thanks!