postgresql – How to identify the column used to partition a table from the POSTGRES catalog

Given a table created as such …

Measure CREATE TABLE (
city_id int not null,
logdate date not null,
peaktemp int,
int units
) PARTITION BY RANGE (logdate);

How to identify the column on which it was partitioned? – in this case, & # 39; logdate & # 39; only by querying the postgres catalog.

I looked in obvious places of the catalog (pg_class, pg_index) but nothing springs.