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Add LATERAL query support

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go-jet 2021-05-03 19:31:04 +02:00
parent 4ef0113f6b
commit 0f773b26d6
6 changed files with 224 additions and 12 deletions
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104
tests/mysql/select_test.go
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@ -1,15 +1,17 @@
package mysql
import (
"strings"
"testing"
"github.com/go-jet/jet/v2/internal/testutils"
. "github.com/go-jet/jet/v2/mysql"
"github.com/go-jet/jet/v2/tests/.gentestdata/mysql/dvds/enum"
"github.com/go-jet/jet/v2/tests/.gentestdata/mysql/dvds/model"
. "github.com/go-jet/jet/v2/tests/.gentestdata/mysql/dvds/table"
"github.com/go-jet/jet/v2/tests/.gentestdata/mysql/dvds/view"
"github.com/stretchr/testify/require"
"testing"
"github.com/stretchr/testify/require"
)
func TestSelect_ScanToStruct(t *testing.T) {
@ -787,3 +789,101 @@ LIMIT 5;
require.Equal(t, dest.Films[1].Title, "ACE GOLDFINGER")
require.Equal(t, dest.Films[4].Title, "AFRICAN EGG")
}
func TestLateral(t *testing.T) {
skipForMariaDB(t) // MariaDB does not implement LATERAL
languages := LATERAL(
SELECT(
Language.AllColumns,
).FROM(
Language,
).WHERE(
Language.Name.NOT_IN(String("spanish")).
AND(Film.LanguageID.EQ(Language.LanguageID)),
),
).AS("films")
stmt := SELECT(
Film.FilmID,
Film.Title,
languages.AllColumns(),
).FROM(
Film.CROSS_JOIN(languages),
).WHERE(
Film.FilmID.EQ(Int(1)),
).ORDER_BY(
Film.FilmID,
).LIMIT(1)
testutils.AssertDebugStatementSql(t, stmt, strings.Replace(`
SELECT film.film_id AS "film.film_id",
film.title AS "film.title",
films.''language.language_id'' AS "language.language_id",
films.''language.name'' AS "language.name",
films.''language.last_update'' AS "language.last_update"
FROM dvds.film
CROSS JOIN LATERAL (
SELECT language.language_id AS "language.language_id",
language.name AS "language.name",
language.last_update AS "language.last_update"
FROM dvds.language
WHERE (language.name NOT IN ('spanish')) AND (film.language_id = language.language_id)
) AS films
WHERE film.film_id = 1
ORDER BY film.film_id
LIMIT 1;
`, "''", "`", -1))
type FilmLanguage struct {
model.Film
model.Language
}
var dest []FilmLanguage
err := stmt.Query(db, &dest)
require.NoError(t, err)
require.Equal(t, dest[0].Film.Title, "ACADEMY DINOSAUR")
require.Equal(t, dest[0].Language.Name, "English")
t.Run("implicit cross join", func(t *testing.T) {
stmt2 := SELECT(
Film.FilmID,
Film.Title,
languages.AllColumns(),
).FROM(
Film,
languages,
).WHERE(
Film.FilmID.EQ(Int(1)),
).ORDER_BY(
Film.FilmID,
).LIMIT(1)
testutils.AssertDebugStatementSql(t, stmt2, strings.Replace(`
SELECT film.film_id AS "film.film_id",
film.title AS "film.title",
films.''language.language_id'' AS "language.language_id",
films.''language.name'' AS "language.name",
films.''language.last_update'' AS "language.last_update"
FROM dvds.film,
LATERAL (
SELECT language.language_id AS "language.language_id",
language.name AS "language.name",
language.last_update AS "language.last_update"
FROM dvds.language
WHERE (language.name NOT IN ('spanish')) AND (film.language_id = language.language_id)
) AS films
WHERE film.film_id = 1
ORDER BY film.film_id
LIMIT 1;
`, "''", "`", -1))
var dest2 []FilmLanguage
err2 := stmt2.Query(db, &dest2)
require.NoError(t, err2)
require.Equal(t, dest, dest2)
})
}