Postgresql简单insert时modify节点的构造

drop table measurement;
CREATE TABLE measurement (
    city_id         int not null,
    logdate         timestamp not null default now(),
    peaktemp        int,
    unitsales       int
) PARTITION BY RANGE (logdate);

CREATE TABLE measurement_y2006m02 PARTITION OF measurement FOR VALUES FROM ('2022-12-01') TO ('2023-01-01');
CREATE TABLE measurement_y2006m03 PARTITION OF measurement FOR VALUES FROM ('2023-01-01') TO ('2023-02-01');

insert into measurement values (1,now(),1,1);