planner: fix uninit timeout for loading bindings (#61891) (#61928)

close #61889

Author: ti-chi-bot

pkg/bindinfo/global_handle.go

@@ -38,6 +38,7 @@ import (
 	"github.com/pingcap/tidb/pkg/util"
 	"github.com/pingcap/tidb/pkg/util/chunk"
 	"github.com/pingcap/tidb/pkg/util/hint"
+	"github.com/pingcap/tidb/pkg/util/intest"
 	utilparser "github.com/pingcap/tidb/pkg/util/parser"
 	"go.uber.org/zap"
 	"golang.org/x/sync/singleflight"
@@ -728,6 +729,7 @@ func (h *globalBindingHandle) LoadBindingsFromStorage(sctx sessionctx.Context, s
 	if sqlDigest == "" {
 		return nil, nil
 	}
+	intest.Assert(sctx.GetSessionVars().LoadBindingTimeout != 0)
 	timeout := time.Duration(sctx.GetSessionVars().LoadBindingTimeout) * time.Millisecond
 	resultChan := h.syncBindingSingleflight.DoChan(sqlDigest, func() (any, error) {
 		return h.loadBindingsFromStorageInternal(sqlDigest)

pkg/sessionctx/variable/session.go

@@ -2276,6 +2276,7 @@ func NewSessionVars(hctx HookContext) *SessionVars {
 	vars.MemTracker.IsRootTrackerOfSess = true
 	vars.MemTracker.Killer = &vars.SQLKiller
 	vars.StatsLoadSyncWait.Store(StatsLoadSyncWait.Load())
+	vars.LoadBindingTimeout = DefTiDBLoadBindingTimeout
 
 	for _, engine := range config.GetGlobalConfig().IsolationRead.Engines {
 		switch engine {

pkg/sessionctx/variable/sysvar.go

@@ -1667,13 +1667,13 @@ var defaultSysVars = []*SysVar{
 	{
 		Scope:                   ScopeGlobal,
 		Name:                    TiDBLoadBindingTimeout,
-		Value:                   "200",
+		Value:                   strconv.Itoa(DefTiDBLoadBindingTimeout),
 		Type:                    TypeUnsigned,
 		MinValue:                0,
 		MaxValue:                math.MaxInt32,
 		IsHintUpdatableVerified: false,
 		SetGlobal: func(ctx context.Context, vars *SessionVars, s string) error {
-			timeoutMS := tidbOptPositiveInt32(s, 0)
+			timeoutMS := tidbOptPositiveInt32(s, DefTiDBLoadBindingTimeout)
 			vars.LoadBindingTimeout = uint64(timeoutMS)
 			return nil
 		}},

pkg/sessionctx/variable/tidb_vars.go

@@ -1605,6 +1605,7 @@ const (
 	DefOptEnableProjectionPushDown                    = true
 	DefTiDBEnableSharedLockPromotion                  = false
 	DefTiDBTSOClientRPCMode                           = TSOClientRPCModeDefault
+	DefTiDBLoadBindingTimeout                         = 200
 )
 
 // Process global variables.