diff --git a/pkg/expr/sql/parser_allow.go b/pkg/expr/sql/parser_allow.go
index 21573b179e1..f19f1bc4e63 100644
--- a/pkg/expr/sql/parser_allow.go
+++ b/pkg/expr/sql/parser_allow.go
@@ -60,7 +60,7 @@ func allowedNode(node sqlparser.SQLNode) (b bool) {
 	case *sqlparser.BinaryExpr, *sqlparser.UnaryExpr:
 		return
 
-	case sqlparser.BoolVal:
+	case sqlparser.BoolVal, *sqlparser.NullVal:
 		return
 
 	case *sqlparser.CaseExpr, *sqlparser.When:
@@ -81,6 +81,15 @@ func allowedNode(node sqlparser.SQLNode) (b bool) {
 	case *sqlparser.ConvertExpr, *sqlparser.ConvertType:
 		return
 
+	case *sqlparser.CollateExpr:
+		return
+
+	case sqlparser.Exprs:
+		return
+
+	case *sqlparser.GroupConcatExpr:
+		return
+
 	case sqlparser.GroupBy:
 		return
 
@@ -132,6 +141,9 @@ func allowedNode(node sqlparser.SQLNode) (b bool) {
 	case *sqlparser.TrimExpr:
 		return
 
+	case sqlparser.ValTuple:
+		return
+
 	case *sqlparser.With:
 		return
 
diff --git a/pkg/expr/sql/parser_allow_test.go b/pkg/expr/sql/parser_allow_test.go
index 31b777edac2..36aca7b0c27 100644
--- a/pkg/expr/sql/parser_allow_test.go
+++ b/pkg/expr/sql/parser_allow_test.go
@@ -42,6 +42,26 @@ func TestAllowQuery(t *testing.T) {
 			q:    `SELECT * FROM a_table WHERE a_column IS NOT NULL`,
 			err:  nil,
 		},
+		{
+			name: "null literal",
+			q:    `SELECT 1 as id, NULL as null_col`,
+			err:  nil,
+		},
+		{
+			name: "val tuple in read query",
+			q:    `SELECT 1 WHERE 1 IN (1, 2, 3)`,
+			err:  nil,
+		},
+		{
+			name: "group concat in read query",
+			q:    `SELECT 1 as id, GROUP_CONCAT('will_', 'concatenate') as concat_val`,
+			err:  nil,
+		},
+		{
+			name: "collate in read query",
+			q:    `SELECT 'some text' COLLATE utf8mb4_bin`,
+			err:  nil,
+		},
 	}
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {