How to use ON CONFLICT with Exclusion Constraint?

Question

for example: index by userid, sdate, edate

userid  sdate       edate
001     2019-01-01  2019-01-30

if I insert new data like:

userid  sdate       edate           
001     2019-01-03  2019-01-20  
   or
001     2019-01-13  2019-02-10  
   or
001     2019-02-01  2019-02-15  

I tried below using GIST, but how to combine it using ON CONFLICT?

CREATE EXTENSION btree_gist

CREATE TABLE test(
   ID INT PRIMARY KEY     NOT NULL,
   USERID     CHAR(5),
   SDATE      DATE,
   EDATE      DATE,
   EXCLUDE USING gist
   (USERID WITH =,
   daterange(SDATE, EDATE, '[]') WITH &&)
);


Insert Into test (usersid, sdate, edate)
Values  (@UsersId, @SDate, @EDate) 
ON Conflict ON CONSTRAINT  test_userid_daterange_excl 
Do Update 
   Set sdate = @SDate, edate = @EDate

I got:

ERROR:  ON CONFLICT DO UPDATE not supported with exclusion constraints

based on the above scenario, I expect, the following:

userid  sdate       edate       I_EXPECT    
001     2019-01-03  2019-01-20  UPDATE because it is in range
001     2019-01-13  2019-02-10  UPDATE because it is in range
001     2019-02-01  2019-02-15  INSERT because it is not in range

select version() shows:

PostgreSQL 10.6 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.3 20140911 (Red Hat 4.8.3-9), 64-bit

Answer 1

You cannot use INSERT ... ON CONFLICT with an exclusion index, like the error message says.

You will have to use code like in example 43.2 from the documentation.