diff --git a/src/sql/engine/expr/ob_expr_operator.cpp b/src/sql/engine/expr/ob_expr_operator.cpp
index 3c872c5d5..5b1af73b9 100644
--- a/src/sql/engine/expr/ob_expr_operator.cpp
+++ b/src/sql/engine/expr/ob_expr_operator.cpp
@@ -2125,13 +2125,16 @@ int ObRelationalExprOperator::deduce_cmp_type(const ObExprOperator &expr,
       // to be compatiable with mysql:
       // if c1 is date or datetime, convert 'c1 = c2+1'to cast (c1 as double) = cast (c2+1 as double)
       const ObRawExpr* cmp_expr = type_ctx.get_raw_expr();
-      const ObRawExpr* date_expr = cmp_expr->get_param_expr(0);
-      const ObRawExpr* other_expr = cmp_expr->get_param_expr(1);
+      const ObRawExpr* date_expr = NULL;
+      const ObRawExpr* other_expr = NULL;
       ObObjType other_expr_type = ObMaxType;
       bool is_date_op_other = false;
-      if (OB_ISNULL(cmp_expr) || OB_ISNULL(date_expr) || OB_ISNULL(other_expr) ) {
+      if (OB_ISNULL(cmp_expr)) {
         ret = OB_ERR_UNEXPECTED;
-        LOG_WARN("unexpected null", K(ret), K(cmp_expr), K(date_expr), K(other_expr));
+        LOG_WARN("unexpected null", K(ret), K(cmp_expr));
+      } else if (OB_ISNULL(date_expr = cmp_expr->get_param_expr(0)) || OB_ISNULL(other_expr = cmp_expr->get_param_expr(1))) {
+        ret = OB_ERR_UNEXPECTED;
+        LOG_WARN("unexpected null", K(ret), K(date_expr), K(other_expr));
       } else {
         if (T_REF_QUERY == other_expr->get_expr_type()) {
           const ObQueryRefRawExpr *ref_expr = static_cast<const ObQueryRefRawExpr*>(other_expr);
diff --git a/src/sql/optimizer/ob_opt_est_utils.cpp b/src/sql/optimizer/ob_opt_est_utils.cpp
index cd5230533..7c435ffd5 100644
--- a/src/sql/optimizer/ob_opt_est_utils.cpp
+++ b/src/sql/optimizer/ob_opt_est_utils.cpp
@@ -313,6 +313,8 @@ int ObOptEstUtils::if_expr_value_equal(ObOptimizerContext &opt_ctx,
     ObExprResType result_type;
     ObExprResType first_type = first_expr.get_result_type();
     ObExprResType second_type = second_expr.get_result_type();
+    ObOpRawExpr equal_expr(const_cast<ObRawExpr *>(&first_expr), const_cast<ObRawExpr *>(&second_expr), T_OP_EQ);
+    type_ctx.set_raw_expr(&equal_expr);
     if (OB_FAIL(ObSQLUtils::wrap_expr_ctx(stmt->get_stmt_type(), *exec_ctx, allocator, expr_ctx))) {
       LOG_WARN("Failed to wrap expr ctx", K(ret));
     } else if (OB_FAIL(equal_op.calc_result_type2(result_type, first_type, second_type, type_ctx))) {