planner: column pruning should use a shallow copy slice (#53237) (#53325)

close #52768

Author: ti-chi-bot

pkg/planner/core/rule_column_pruning.go

@@ -18,6 +18,7 @@ import (
 	"bytes"
 	"context"
 	"fmt"
+	"slices"
 
 	"github.com/pingcap/tidb/pkg/expression"
 	"github.com/pingcap/tidb/pkg/expression/aggregation"
@@ -34,7 +35,7 @@ type columnPruner struct {
 
 func (*columnPruner) optimize(_ context.Context, lp LogicalPlan, opt *util.LogicalOptimizeOp) (LogicalPlan, bool, error) {
 	planChanged := false
-	lp, err := lp.PruneColumns(lp.Schema().Columns, opt)
+	lp, err := lp.PruneColumns(slices.Clone(lp.Schema().Columns), opt)
 	if err != nil {
 		return nil, planChanged, err
 	}