diff --git a/pkg/ddl/cluster.go b/pkg/ddl/cluster.go
index 342d68cbe4a77..b210113fad9d2 100644
--- a/pkg/ddl/cluster.go
+++ b/pkg/ddl/cluster.go
@@ -61,18 +61,6 @@ const (
 	flashbackTimeout    = 3 * time.Minute // 3min
 )
 
-const (
-	pdScheduleArgsOffset = 1 + iota
-	gcEnabledOffset
-	autoAnalyzeOffset
-	readOnlyOffset
-	totalLockedRegionsOffset
-	startTSOffset
-	commitTSOffset
-	ttlJobEnableOffSet
-	keyRangesOffset
-)
-
 func closePDSchedule(ctx context.Context) error {
 	closeMap := make(map[string]any)
 	for _, key := range pdScheduleKey {
diff --git a/pkg/ddl/ingest/message.go b/pkg/ddl/ingest/message.go
index 88c708439a7e0..6db3aef665ccf 100644
--- a/pkg/ddl/ingest/message.go
+++ b/pkg/ddl/ingest/message.go
@@ -59,13 +59,6 @@ const (
 	LitInfoUnsafeImport     string = "do a partial import data into the storage"
 )
 
-func genBackendAllocMemFailedErr(ctx context.Context, memRoot MemRoot, jobID int64) error {
-	logutil.Logger(ctx).Warn(LitErrAllocMemFail, zap.Int64("job ID", jobID),
-		zap.Int64("current memory usage", memRoot.CurrentUsage()),
-		zap.Int64("max memory quota", memRoot.MaxMemoryQuota()))
-	return dbterror.ErrIngestFailed.FastGenByArgs("memory used up")
-}
-
 func genEngineAllocMemFailedErr(ctx context.Context, memRoot MemRoot, jobID int64, idxIDs []int64) error {
 	logutil.Logger(ctx).Warn(LitErrAllocMemFail,
 		zap.Int64("job ID", jobID),
diff --git a/pkg/planner/core/indexmerge_path.go b/pkg/planner/core/indexmerge_path.go
index 3c3d144606ea3..cdf494191eae0 100644
--- a/pkg/planner/core/indexmerge_path.go
+++ b/pkg/planner/core/indexmerge_path.go
@@ -634,7 +634,6 @@ func generateANDIndexMerge4ComposedIndex(ds *logicalop.DataSource, normalPathCnt
 
 	// Collect access paths that satisfy the hints, and make sure there is at least one MV index path.
 	var mvIndexPathCnt int
-	candidateAccessPaths := make([]*util.AccessPath, 0, len(ds.PossibleAccessPaths))
 	for idx := range normalPathCnt {
 		if (ds.PossibleAccessPaths[idx].IsTablePath() &&
 			!isInIndexMergeHints(ds, "primary")) ||
@@ -645,7 +644,6 @@ func generateANDIndexMerge4ComposedIndex(ds *logicalop.DataSource, normalPathCnt
 		if isMVIndexPath(ds.PossibleAccessPaths[idx]) {
 			mvIndexPathCnt++
 		}
-		candidateAccessPaths = append(candidateAccessPaths, ds.PossibleAccessPaths[idx])
 	}
 	if mvIndexPathCnt == 0 {
 		return nil
diff --git a/pkg/planner/core/planbuilder.go b/pkg/planner/core/planbuilder.go
index 49c1981680480..2c7433d2b2b9e 100644
--- a/pkg/planner/core/planbuilder.go
+++ b/pkg/planner/core/planbuilder.go
@@ -6112,7 +6112,6 @@ func getTablePath(paths []*util.AccessPath) *util.AccessPath {
 
 func (b *PlanBuilder) buildAdminAlterDDLJob(ctx context.Context, as *ast.AdminStmt) (_ base.Plan, err error) {
 	options := make([]*AlterDDLJobOpt, 0, len(as.AlterJobOptions))
-	optionNames := make([]string, 0, len(as.AlterJobOptions))
 	mockTablePlan := logicalop.LogicalTableDual{}.Init(b.ctx, b.getSelectOffset())
 	for _, opt := range as.AlterJobOptions {
 		_, ok := allowedAlterDDLJobParams[opt.Name]
@@ -6130,7 +6129,6 @@ func (b *PlanBuilder) buildAdminAlterDDLJob(ctx context.Context, as *ast.AdminSt
 			return nil, err
 		}
 		options = append(options, &alterDDLJobOpt)
-		optionNames = append(optionNames, opt.Name)
 	}
 	p := &AlterDDLJob{
 		JobID:   as.JobNumber,