Hi
I have a set of CSV data that I'm importing containing dates stored as INT values (eg 20150402). The value 0 represents a null date in this format.
I've created a function and cast that (ab)uses the system text::date cast:
CREATE FUNCTION to_date(integer) RETURNS date AS $$SELECT CASE WHEN $1<=0 THEN NULL ELSE CONCAT(($1/10000)::text, '-', (($1/100)%100)::text, '-', ($1%100)::text)::date END$$ LANGUAGE SQL;
CREATE CAST (integer AS date) WITH FUNCTION to_date(integer) AS IMPLICIT;
This works fine if I
CREATE TABLE mytable (dt date NULL);
INSERT INTO mytable (dt) VALUES (0);
mydb=# INSERT INTO mytable (dt) VALUES (0);
INSERT 0 1
Time: 1.562 ms
but if I use
COPY mytable (dt) FROM STDIN WITH (FORMAT csv, HEADER false);
0
\.
it fails.
ERROR: date/time field value out of range: "0"
HINT: Perhaps you need a different "datestyle" setting.
CONTEXT: COPY mytable, line 1, column dt: "0"
Is there a trick I can use to get COPY FROM to use my cast? Is it somehow treating all the CSV values as strings and then trying to cast to the target type? I tried creating similar CASTs for text, char and varchar to call my to_date function but none of them made a difference.
Thanks!
Geoff
