to issue<48907696>:fix udf containing complex type execute slow issue

src/pl/ob_pl.cpp

@@ -200,6 +200,19 @@ void ObPLCtx::reset_obj()
   objects_.reset();
 }
 
+void ObPLCtx::reset_obj_range_to_end(int64_t index)
+{
+  int tmp_ret = OB_SUCCESS;
+  if (index < objects_.count() && index >= 0) {
+    for (int64_t i = objects_.count() - 1; i >= index; i--) {
+      if (OB_SUCCESS != (tmp_ret = ObUserDefinedType::destruct_obj(objects_.at(i)))) {
+        LOG_WARN_RET(tmp_ret, "failed to destruct pl object", K(i), K(tmp_ret));
+      }
+      objects_.pop_back();
+    }
+  }
+}
+
 ObPLCtx::~ObPLCtx()
 {
   reset_obj();

src/pl/ob_pl.h

@@ -703,6 +703,7 @@ public:
     objects_.reset();
   }
   void reset_obj();
+  void reset_obj_range_to_end(int64_t index);
   common::ObIArray<ObObj>& get_objects() { return objects_; }
 private:
   // 用于收集在PL执行过程中使用到的Allocator,
@@ -712,31 +713,6 @@ private:
   ObSEArray<ObObj, 32> objects_;
 };
 
-class ObPLCtxGuard
-{
-public:
-  ObPLCtxGuard(ObPLCtx *ctx, int& ret) : ctx_(ctx), ret_(ret) {
-    if (OB_SUCCESS == ret_ && OB_NOT_NULL(ctx)) {
-      ret_ = objects_.assign(ctx->get_objects());
-      ctx_->clear();
-    }
-  }
-
-  ~ObPLCtxGuard() {
-    if (OB_SUCCESS == ret_ && OB_NOT_NULL(ctx_)) {
-      for (int64_t i = 0; OB_SUCCESS == ret_ && i < objects_.count(); ++i) {
-        ret_ = ctx_->add(objects_.at(i));
-      }
-    }
-  }
-
-private:
-  ObPLCtx *ctx_;
-  int &ret_;
-  ObSEArray<ObObj, 4> objects_;
-};
-
-
 class ObPLPackageGuard;
 
 #define IDX_PLEXECCTX_VTABLE 0

src/sql/engine/expr/ob_expr_udf.cpp

@@ -444,10 +444,12 @@ int ObExprUDF::eval_udf(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res)
       session->set_start_stmt();
     }
 
-    pl::ObPLCtxGuard guard(ctx.exec_ctx_.get_pl_ctx(), ret);
-
     ObEvalCtx::TempAllocGuard memory_guard(ctx);
     ObArenaAllocator &allocator = memory_guard.get_allocator();
+    int64_t cur_obj_count = 0;
+    if (OB_NOT_NULL(ctx.exec_ctx_.get_pl_ctx())) {
+      cur_obj_count = ctx.exec_ctx_.get_pl_ctx()->get_objects().count();
+    }
 
     ObObj *objs = nullptr;
     if (expr.arg_cnt_ > 0) {
@@ -505,11 +507,11 @@ int ObExprUDF::eval_udf(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res)
         OZ (pl::ObUserDefinedType::deep_copy_obj(alloc, tmp_result, result, true));
         OZ (pl::ObUserDefinedType::destruct_obj(tmp_result, ctx.exec_ctx_.get_my_session()));
         CK (OB_NOT_NULL(ctx.exec_ctx_.get_pl_ctx()));
-        OX (ctx.exec_ctx_.get_pl_ctx()->reset_obj());
+        OX (ctx.exec_ctx_.get_pl_ctx()->reset_obj_range_to_end(cur_obj_count));
         OZ (ctx.exec_ctx_.get_pl_ctx()->add(result));
       } else {
         result = tmp_result;
-        OX (ctx.exec_ctx_.get_pl_ctx()->reset_obj());
+        OX (ctx.exec_ctx_.get_pl_ctx()->reset_obj_range_to_end(cur_obj_count));
       }
     } else {
       result = tmp_result;