add mockDefiner to allow views select for users without CREATE VIEW grant

Author: elianddb

enginetest/queries/priv_auth_queries.go

@@ -108,6 +108,28 @@ type ServerAuthenticationTestAssertion struct {
 // UserPrivTests test the user and privilege systems. These tests always have the root account available, and the root
 // account is used with any queries in the SetUpScript.
 var UserPrivTests = []UserPrivilegeTest{
+	{
+		Name: "Selecting a view only needs SELECT grants",
+		SetUpScript: []string{
+			"CREATE TABLE perms_t (id INT PRIMARY KEY, val VARCHAR(10));",
+			"INSERT INTO perms_t VALUES (1, 'a'), (2, 'b');",
+			"CREATE VIEW perms_v AS SELECT id, val FROM perms_t ORDER BY id;",
+			"CREATE USER 'view_reader'@'localhost' IDENTIFIED BY 'pw';",
+			"GRANT SELECT ON perms_t TO 'view_reader'@'localhost';",
+			"GRANT SELECT ON perms_v TO 'view_reader'@'localhost';",
+		},
+		Assertions: []UserPrivilegeTestAssertion{
+			{
+				User:  "view_reader",
+				Host:  "localhost",
+				Query: "SELECT * FROM perms_v",
+				Expected: []sql.Row{
+					{int64(1), "a"},
+					{int64(2), "b"},
+				},
+			},
+		},
+	},
 	{
 		Name: "Create user limits",
 		Assertions: []UserPrivilegeTestAssertion{

sql/base_session.go

@@ -96,7 +96,6 @@ func (s *BaseSession) Client() Client { return s.client }
 // SetClient implements the Session interface.
 func (s *BaseSession) SetClient(c Client) {
 	s.client = c
-	return
 }
 
 // GetAllSessionVariables implements the Session interface.

sql/planbuilder/definer.go

@@ -0,0 +1,51 @@
+// Copyright 2025 Dolthub, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package planbuilder
+
+import (
+	"github.com/dolthub/go-mysql-server/sql"
+	"github.com/dolthub/go-mysql-server/sql/mysql_db"
+)
+
+// mockDefiner temporarily impersonates the view definer during binding. It clones the current authorization state
+// (when available), adds the requested global privileges (e.g. CREATE VIEW), and updates both the session privilege
+// cache and the cached AuthorizationQueryState. Callers must defer the returned restore function.
+func (b *Builder) mockDefiner(privileges ...sql.PrivilegeType) func() {
+	if b == nil || b.ctx == nil || b.ctx.Session == nil {
+		return func() {}
+	}
+
+	var privilegeSet mysql_db.PrivilegeSet
+	if state, ok := b.authQueryState.(defaultAuthorizationQueryState); ok && state.enabled {
+		privilegeSet = state.privSet.Copy()
+	} else {
+		privilegeSet = mysql_db.NewPrivilegeSet()
+	}
+	privilegeSet.AddGlobalStatic(privileges...)
+
+	initialAuthQueryState := b.authQueryState
+	if state, ok := b.authQueryState.(defaultAuthorizationQueryState); ok {
+		state.privSet = privilegeSet
+		b.authQueryState = state
+	}
+
+	initialPrivilegeSet, initialCounter := b.ctx.Session.GetPrivilegeSet()
+	b.ctx.SetPrivilegeSet(privilegeSet, initialCounter)
+
+	return func() {
+		b.authQueryState = initialAuthQueryState
+		b.ctx.SetPrivilegeSet(initialPrivilegeSet, initialCounter)
+	}
+}

sql/planbuilder/from.go

@@ -845,6 +845,9 @@ func (b *Builder) resolveView(name string, database sql.Database, asOf interface
 			if err != nil {
 				b.handleErr(err)
 			}
+			// TODO: Once view definers are persisted, load the real definer client
+			restoreInvoker := b.mockDefiner(sql.PrivilegeType_CreateView)
+			defer restoreInvoker()
 			node, _, err := b.bindOnlyWithDatabase(database, stmt, viewDef.CreateViewStatement)
 			if err != nil {
 				// TODO: Need to account for non-existing functions or