Add a test case to show that MultiEqual is supported by lookup vind…

…exes.

Signed-off-by: Arthur Schreiber <arthurschreiber@github.com>

go/test/endtoend/vtgate/lookup_test.go

@@ -552,6 +552,22 @@ func TestConsistentLookupUpdate(t *testing.T) {
 	require.Empty(t, qr.Rows)
 }
 
+func TestSelectMultiEqualLookup(t *testing.T) {
+	conn, closer := start(t)
+	defer closer()
+
+	utils.Exec(t, conn, "insert into t10 (id, sharding_key, col1) values (1, 1, 'bar'), (2, 1, 'bar'), (3, 1, 'bar'), (4, 2, 'bar'), (5, 2, 'bar')")
+
+	for _, workload := range []string{"oltp", "olap"} {
+		t.Run(workload, func(t *testing.T) {
+			utils.Exec(t, conn, "set workload = "+workload)
+
+			utils.AssertMatches(t, conn, "select id from t10 WHERE (col1, id) IN (('bar', 1), ('baz', 2), ('qux', 3), ('barbar', 4))", "[[INT64(1)]]")
+			utils.AssertMatches(t, conn, "select id from t10 WHERE (col1 = 'bar' AND id = 1) OR (col1 = 'baz' AND id = 2) OR (col1 = 'qux' AND id = 3) OR (col1 = 'barbar' AND id = 4)", "[[INT64(1)]]")
+		})
+	}
+}
+
 func TestSelectNullLookup(t *testing.T) {
 	conn, closer := start(t)
 	defer closer()

go/test/endtoend/vtgate/schema.sql

@@ -164,4 +164,4 @@ create table t11
     col2 int,
     col3 int,
     primary key (id)
-) Engine = InnoDB;
+) Engine = InnoDB;