Fix multiple test suites to expect OkResult for SET statements

Updated test expectations across multiple test suites:
- TestJoinPlanning: Fixed SET disable_merge_join expectation
- TestAnsiQuotesSqlMode: Fixed 7 SET sql_mode statements
- TestPersist: Fixed 3 SET PERSIST statements
- TestScripts: Fixed 4 SET time_zone statements
- TestIndexPrefix: Fixed SET strict_mysql_compatibility statement

All tests now expect types.NewOkResult(0) instead of empty rows {} for SET statements,
matching the corrected MySQL-compatible behavior from the SET statement fix.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: macneale4

enginetest/enginetests.go

@@ -5277,17 +5277,17 @@ func TestPersist(t *testing.T, harness Harness, newPersistableSess func(ctx *sql
 	}{
 		{
 			Query:           "SET PERSIST max_connections = 1000;",
-			Expected:        []sql.Row{{}},
+			Expected:        []sql.Row{{types.NewOkResult(0)}},
 			ExpectedGlobal:  int64(1000),
 			ExpectedPersist: int64(1000),
 		}, {
 			Query:           "SET @@PERSIST.max_connections = 1000;",
-			Expected:        []sql.Row{{}},
+			Expected:        []sql.Row{{types.NewOkResult(0)}},
 			ExpectedGlobal:  int64(1000),
 			ExpectedPersist: int64(1000),
 		}, {
 			Query:           "SET PERSIST_ONLY max_connections = 1000;",
-			Expected:        []sql.Row{{}},
+			Expected:        []sql.Row{{types.NewOkResult(0)}},
 			ExpectedGlobal:  int64(151),
 			ExpectedPersist: int64(1000),
 		},

enginetest/join_planning_tests.go

@@ -28,6 +28,7 @@ import (
 	"github.com/dolthub/go-mysql-server/sql/plan"
 	"github.com/dolthub/go-mysql-server/sql/planbuilder"
 	"github.com/dolthub/go-mysql-server/sql/transform"
+	"github.com/dolthub/go-mysql-server/sql/types"
 )
 
 type JoinPlanTest struct {
@@ -103,7 +104,7 @@ var JoinPlanningTests = []joinPlanScript{
 			},
 			{
 				q:   "set @@SESSION.disable_merge_join = 1",
-				exp: []sql.Row{{}},
+				exp: []sql.Row{{types.NewOkResult(0)}},
 			},
 			{
 				q:     "select /*+ JOIN_ORDER(ab, xy) MERGE_JOIN(ab, xy)*/ * from ab join xy on y = a order by 1, 3",

enginetest/queries/ansi_quotes_queries.go

@@ -71,7 +71,7 @@ var AnsiQuotesTests = []ScriptTest{
 			{
 				// Disable ANSI_QUOTES and make sure we can still run queries
 				Query:    `SET @@sql_mode='NO_ENGINE_SUBSTITUTION,ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES';`,
-				Expected: []sql.Row{{}},
+				Expected: []sql.Row{{types.NewOkResult(0)}},
 			},
 			{
 				Query:    `select "data" from auctions order by "ai" desc;`,
@@ -154,7 +154,7 @@ var AnsiQuotesTests = []ScriptTest{
 			{
 				// Disable ANSI_QUOTES mode
 				Query:    `SET @@sql_mode='NO_ENGINE_SUBSTITUTION,ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES';`,
-				Expected: []sql.Row{{}},
+				Expected: []sql.Row{{types.NewOkResult(0)}},
 			},
 			{
 				Query:    `show create table view1;`,
@@ -197,7 +197,7 @@ var AnsiQuotesTests = []ScriptTest{
 			{
 				// Disable ANSI_QUOTES mode
 				Query:    `SET @@sql_mode='NO_ENGINE_SUBSTITUTION,ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES';`,
-				Expected: []sql.Row{{}},
+				Expected: []sql.Row{{types.NewOkResult(0)}},
 			},
 			{
 				Query:    `insert into t values (2, 'George', 'SomethingElse');`,
@@ -237,7 +237,7 @@ var AnsiQuotesTests = []ScriptTest{
 			{
 				// Disable ANSI_QUOTES mode
 				Query:    `SET @@sql_mode='NO_ENGINE_SUBSTITUTION,ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES';`,
-				Expected: []sql.Row{{}},
+				Expected: []sql.Row{{types.NewOkResult(0)}},
 			},
 			{
 				// Assert the procedure runs correctly with ANSI_QUOTES mode disabled
@@ -269,7 +269,7 @@ var AnsiQuotesTests = []ScriptTest{
 			{
 				// Disable ANSI_QUOTES mode
 				Query:    `SET @@sql_mode='NO_ENGINE_SUBSTITUTION,ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES';`,
-				Expected: []sql.Row{{}},
+				Expected: []sql.Row{{types.NewOkResult(0)}},
 			},
 			{
 				// Insert a row with ANSI_QUOTES mode disabled
@@ -298,7 +298,7 @@ var AnsiQuotesTests = []ScriptTest{
 			{
 				// Disable ANSI_QUOTES mode
 				Query:    `SET @@sql_mode='NO_ENGINE_SUBSTITUTION,ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES';`,
-				Expected: []sql.Row{{}},
+				Expected: []sql.Row{{types.NewOkResult(0)}},
 			},
 			{
 				// Assert the check constraint runs correctly when ANSI_QUOTES mode is disabled
@@ -328,7 +328,7 @@ var AnsiQuotesTests = []ScriptTest{
 			{
 				// Disable ANSI_QUOTES mode and make sure we can still list and run events
 				Query:    `SET @@sql_mode='NO_ENGINE_SUBSTITUTION,ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES';`,
-				Expected: []sql.Row{{}},
+				Expected: []sql.Row{{types.NewOkResult(0)}},
 			},
 			{
 				Query:    `SHOW EVENTS;`,

enginetest/queries/index_queries.go

@@ -4011,7 +4011,7 @@ var IndexPrefixQueries = []ScriptTest{
 		Assertions: []ScriptTestAssertion{
 			{
 				Query:    "set @@strict_mysql_compatibility = true;",
-				Expected: []sql.Row{{}},
+				Expected: []sql.Row{{types.NewOkResult(0)}},
 			},
 			{
 				Query:    "select @@strict_mysql_compatibility;",

enginetest/queries/script_queries.go

@@ -5338,7 +5338,7 @@ CREATE TABLE tab3 (
 		Assertions: []ScriptTestAssertion{
 			{
 				Query:    "SET time_zone = '+07:00';",
-				Expected: []sql.Row{{}},
+				Expected: []sql.Row{{types.NewOkResult(0)}},
 			},
 			{
 				Query:    "SELECT UNIX_TIMESTAMP('2023-09-25 07:02:57');",
@@ -5350,15 +5350,15 @@ CREATE TABLE tab3 (
 			},
 			{
 				Query:    "SET time_zone = '+00:00';",
-				Expected: []sql.Row{{}},
+				Expected: []sql.Row{{types.NewOkResult(0)}},
 			},
 			{
 				Query:    "SELECT UNIX_TIMESTAMP('2023-09-25 07:02:57');",
 				Expected: []sql.Row{{1695625377}},
 			},
 			{
 				Query:    "SET time_zone = '-06:00';",
-				Expected: []sql.Row{{}},
+				Expected: []sql.Row{{types.NewOkResult(0)}},
 			},
 			{
 				Query:    "SELECT UNIX_TIMESTAMP('2023-09-25 07:02:57');",
@@ -9977,7 +9977,7 @@ var BrokenScriptTests = []ScriptTest{
 		Assertions: []ScriptTestAssertion{
 			{
 				Query:    "SET SESSION time_zone = '-05:00';",
-				Expected: []sql.Row{{}},
+				Expected: []sql.Row{{types.NewOkResult(0)}},
 			},
 			{
 				Query:    "SELECT DATE_FORMAT(ts, '%H:%i:%s'), DATE_FORMAT(dt, '%H:%i:%s') from timezone_test;",