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[Postgres] Add support for DISTINCT ON clause.

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go-jet 2022-01-06 18:11:26 +01:00
parent 5cbf4aac86
commit 6fe9c26d30
3 changed files with 69 additions and 4 deletions
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57
tests/postgres/select_test.go
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@ -48,6 +48,63 @@ WHERE actor.actor_id = 2;
requireLogged(t, query)
}
func TestSelectDistinctOn(t *testing.T) {
stmt := SELECT(
Rental.StaffID,
Rental.CustomerID,
Rental.RentalID,
).DISTINCT(
Rental.StaffID,
Rental.CustomerID,
).FROM(
Rental,
).WHERE(
Rental.CustomerID.LT(Int(2)),
).ORDER_BY(
Rental.StaffID.ASC(),
Rental.CustomerID.ASC(),
Rental.RentalID.ASC(),
)
testutils.AssertDebugStatementSql(t, stmt, `
SELECT DISTINCT ON (rental.staff_id, rental.customer_id) rental.staff_id AS "rental.staff_id",
rental.customer_id AS "rental.customer_id",
rental.rental_id AS "rental.rental_id"
FROM dvds.rental
WHERE rental.customer_id < 2
ORDER BY rental.staff_id ASC, rental.customer_id ASC, rental.rental_id ASC;
`)
var dest []model.Rental
err := stmt.Query(db, &dest)
require.NoError(t, err)
testutils.AssertJSON(t, dest, `
[
{
"RentalID": 573,
"RentalDate": "0001-01-01T00:00:00Z",
"InventoryID": 0,
"CustomerID": 1,
"ReturnDate": null,
"StaffID": 1,
"LastUpdate": "0001-01-01T00:00:00Z"
},
{
"RentalID": 76,
"RentalDate": "0001-01-01T00:00:00Z",
"InventoryID": 0,
"CustomerID": 1,
"ReturnDate": null,
"StaffID": 2,
"LastUpdate": "0001-01-01T00:00:00Z"
}
]
`)
}
func TestClassicSelect(t *testing.T) {
expectedSQL := `
SELECT payment.payment_id AS "payment.payment_id",