diff --git a/src/sql/resolver/expr/ob_raw_expr_deduce_type.cpp b/src/sql/resolver/expr/ob_raw_expr_deduce_type.cpp
index d1b1166ff..d88dfb625 100644
--- a/src/sql/resolver/expr/ob_raw_expr_deduce_type.cpp
+++ b/src/sql/resolver/expr/ob_raw_expr_deduce_type.cpp
@@ -1659,12 +1659,7 @@ int ObRawExprDeduceType::visit(ObAggFunRawExpr &expr)
             // But for expression like sum(sum()), the outer sum() is generated by
             // aggregation pushdown, so we don't need to accumulate precision for the outer expr.
             if (T_FUN_SUM == expr.get_expr_type() && T_FUN_SUM != child_expr->get_expr_type()) {
-              if (child_expr->get_expr_type() == T_FUN_SYS_CAST
-                  && child_expr->has_flag(IS_OP_OPERAND_IMPLICIT_CAST)
-                  && ob_is_decimal_int(obj_type)) {
-                // child is implicit cast expr means precision already adjusted
-                // do nothing
-              } else if (ob_is_integer_type(obj_type)) {
+              if (ob_is_integer_type(obj_type)) {
                 const int16_t int_max_prec = ObAccuracy::MAX_ACCURACY2[0/*mysql mode*/][obj_type].get_precision();
                 result_precision = MAX(result_precision, int_max_prec) + OB_DECIMAL_LONGLONG_DIGITS;
                 result_precision = MIN(OB_MAX_DECIMAL_PRECISION, result_precision);
@@ -1930,9 +1925,10 @@ int ObRawExprDeduceType::visit(ObAggFunRawExpr &expr)
       if (T_FUN_AVG == expr.get_expr_type() && -2 != scale_increment_recover) {
         result_type.set_calc_scale(scale_increment_recover);
       }
-      if (T_FUN_SUM == expr.get_expr_type() &&
-            ob_is_bit_tc(expr.get_param_expr(0)->get_result_type().get_type())) {
-        // set calc precision as child precision for bit type.
+      ObObjType child_type = expr.get_param_expr(0)->get_result_type().get_type();
+      if (T_FUN_SUM == expr.get_expr_type() && result_type.get_calc_meta().is_decimal_int()
+          && (!ob_is_integer_type(child_type) && !ob_is_decimal_int(child_type))) {
+        // set calc precision as child precision for types other than integers
         result_type.set_calc_precision(expr.get_param_expr(0)->get_result_type().get_precision());
       }
       expr.set_result_type(result_type);