planbuilder: Keep with clause when build recursive cte

planner/core/casetest/testdata/plan_suite_in.json

@@ -796,6 +796,7 @@
   {
     "name": "TestSingleConsumerCTE",
     "cases": [
+      "with base1 as (WITH RECURSIVE cte(a) AS (with tmp as (select 1 as a) SELECT a from tmp UNION SELECT a+1 FROM cte) SELECT * FROM cte) select * from base1; -- issue #43318",
       "with cte as (select 1) select * from cte; -- inline cte",
       "with cte1 as (select 1), cte2 as (select 2) select * from cte1 union select * from cte2; -- inline cte1, cte2",
       "with cte as (select 1) select * from cte union select * from cte; -- cannot be inlined",

planner/core/casetest/testdata/plan_suite_out.json

@@ -3750,6 +3750,18 @@
   {
     "Name": "TestSingleConsumerCTE",
     "Cases": [
+      {
+        "SQL": "with base1 as (WITH RECURSIVE cte(a) AS (with tmp as (select 1 as a) SELECT a from tmp UNION SELECT a+1 FROM cte) SELECT * FROM cte) select * from base1; -- issue #43318",
+        "Plan": [
+          "CTEFullScan 2.00 root CTE:cte data:CTE_3",
+          "CTE_3 2.00 root  Recursive CTE",
+          "├─Projection(Seed Part) 1.00 root  1->Column#15",
+          "│ └─TableDual 1.00 root  rows:1",
+          "└─Projection(Recursive Part) 1.00 root  cast(plus(Column#16, 1), bigint(1) BINARY)->Column#18",
+          "  └─CTETable 1.00 root  Scan on CTE_3"
+        ],
+        "Warning": null
+      },
       {
         "SQL": "with cte as (select 1) select * from cte; -- inline cte",
         "Plan": [

planner/core/logical_plan_builder.go

@@ -7145,9 +7145,9 @@ func (b *PlanBuilder) buildRecursiveCTE(ctx context.Context, cte ast.ResultSetNo
 		// 1. Handle the WITH clause if exists.
 		if x.With != nil {
 			l := len(b.outerCTEs)
+			sw := x.With
 			defer func() {
 				b.outerCTEs = b.outerCTEs[:l]
-				sw := x.With
 				x.With = sw
 			}()
 			err := b.buildWith(ctx, x.With)