sqlparser: fix broken unit test

The last commit broke one unit test because it was using
upper case INDEX names, which is not possible in vitess.
Only table names can contain upper case letters.

go/vt/tabletserver/query_executor_test.go

@@ -468,7 +468,7 @@ func TestQueryExecutorPlanPKIn(t *testing.T) {
 func TestQueryExecutorPlanSelectSubQuery(t *testing.T) {
 	db := setUpQueryExecutorTest()
 	query := "select * from test_table where name = 1 limit 1000"
-	expandedQuery := "select pk from test_table use index (INDEX) where name = 1 limit 1000"
+	expandedQuery := "select pk from test_table use index (`index`) where name = 1 limit 1000"
 	want := &mproto.QueryResult{
 		Fields: getTestTableFields(),
 	}
@@ -1055,7 +1055,7 @@ func TestQueryExecutorTableAclExemptACL(t *testing.T) {
 func TestQueryExecutorBlacklistQRFail(t *testing.T) {
 	db := setUpQueryExecutorTest()
 	query := "select * from test_table where name = 1 limit 1000"
-	expandedQuery := "select pk from test_table use index (INDEX) where name = 1 limit 1000"
+	expandedQuery := "select pk from test_table use index (`index`) where name = 1 limit 1000"
 	expected := &mproto.QueryResult{
 		Fields: getTestTableFields(),
 	}
@@ -1114,7 +1114,7 @@ func TestQueryExecutorBlacklistQRFail(t *testing.T) {
 func TestQueryExecutorBlacklistQRRetry(t *testing.T) {
 	db := setUpQueryExecutorTest()
 	query := "select * from test_table where name = 1 limit 1000"
-	expandedQuery := "select pk from test_table use index (INDEX) where name = 1 limit 1000"
+	expandedQuery := "select pk from test_table use index (`index`) where name = 1 limit 1000"
 	expected := &mproto.QueryResult{
 		Fields: getTestTableFields(),
 	}
@@ -1377,7 +1377,7 @@ func getQueryExecutorSupportedQueries() map[string]*mproto.QueryResult {
 				[]sqltypes.Value{
 					sqltypes.MakeString([]byte{}),
 					sqltypes.MakeString([]byte{}),
-					sqltypes.MakeString([]byte("INDEX")),
+					sqltypes.MakeString([]byte("index")),
 					sqltypes.MakeString([]byte{}),
 					sqltypes.MakeString([]byte("name")),
 					sqltypes.MakeString([]byte{}),