diff --git a/src/sql/optimizer/ob_log_plan.cpp b/src/sql/optimizer/ob_log_plan.cpp
index 6e3298e639..a5bf9544af 100644
--- a/src/sql/optimizer/ob_log_plan.cpp
+++ b/src/sql/optimizer/ob_log_plan.cpp
@@ -14007,7 +14007,8 @@ int ObLogPlan::deduce_redundant_join_conds(const ObIArray<ObRawExpr*> &quals,
   ObSEArray<ObRelIds, 8> connect_infos;
   ObSEArray<ObRelIds, 8> single_table_ids;
   ObRelIds table_ids;
-  if (OB_FAIL(ObEqualAnalysis::compute_equal_set(&allocator_,
+  ObArenaAllocator allocator(ObModIds::OB_SQL_OPTIMIZER_EQUAL_SETS, OB_MALLOC_NORMAL_BLOCK_SIZE, MTL_ID());
+  if (OB_FAIL(ObEqualAnalysis::compute_equal_set(&allocator,
                                                  quals,
                                                  all_equal_sets))) {
     LOG_WARN("failed to compute equal set", K(ret));
diff --git a/src/sql/rewrite/ob_equal_analysis.cpp b/src/sql/rewrite/ob_equal_analysis.cpp
index e837d857d9..06b458e27c 100644
--- a/src/sql/rewrite/ob_equal_analysis.cpp
+++ b/src/sql/rewrite/ob_equal_analysis.cpp
@@ -20,7 +20,7 @@ using namespace common;
 namespace sql
 {
 ObEqualAnalysis::ObEqualAnalysis()
-    : equal_set_alloc_(ObModIds::OB_SQL_OPTIMIZER_EQUAL_SETS),
+    : equal_set_alloc_(ObMemAttr(MTL_ID(), ObModIds::OB_SQL_OPTIMIZER_EQUAL_SETS)),
       column_set_(),
       equal_sets_()
 {