diff --git a/src/sql/optimizer/ob_join_order.cpp b/src/sql/optimizer/ob_join_order.cpp
index 595fdc5c67..a185a6de64 100644
--- a/src/sql/optimizer/ob_join_order.cpp
+++ b/src/sql/optimizer/ob_join_order.cpp
@@ -12007,6 +12007,10 @@ int ObJoinOrder::can_extract_unprecise_range(const uint64_t table_id,
     if (OB_ISNULL(l_expr) || OB_ISNULL(r_expr)) {
       ret = OB_ERR_UNEXPECTED;
       LOG_WARN("unexpected null expr", K(ret));
+    } else if (OB_FAIL(ObOptimizerUtil::get_expr_without_lossless_cast(l_expr, l_expr))) {
+      LOG_WARN("failed to get expr without lossless cast", K(ret));
+    } else if (OB_FAIL(ObOptimizerUtil::get_expr_without_lossless_cast(r_expr, r_expr))) {
+      LOG_WARN("failed to get expr without lossless cast", K(ret));
     } else if (l_expr->is_dynamic_const_expr() && r_expr->is_column_ref_expr()) {
       column = static_cast<const ObColumnRefRawExpr*>(r_expr);
       exec_param = l_expr;
@@ -12035,6 +12039,8 @@ int ObJoinOrder::can_extract_unprecise_range(const uint64_t table_id,
     if (OB_ISNULL(first_expr) || OB_ISNULL(patten_expr) || OB_ISNULL(escape_expr)) {
       ret = OB_ERR_UNEXPECTED;
       LOG_WARN("unexpected null expr", K(ret));
+    } else if (OB_FAIL(ObOptimizerUtil::get_expr_without_lossless_cast(first_expr, first_expr))) {
+      LOG_WARN("failed to get expr without lossless cast", K(ret));
     } else if (first_expr->is_column_ref_expr() &&
                patten_expr->is_dynamic_const_expr() &&
                escape_expr->is_static_const_expr()) {
diff --git a/src/sql/optimizer/ob_optimizer_util.cpp b/src/sql/optimizer/ob_optimizer_util.cpp
index a3ddf89af4..f0dd93d597 100644
--- a/src/sql/optimizer/ob_optimizer_util.cpp
+++ b/src/sql/optimizer/ob_optimizer_util.cpp
@@ -6193,6 +6193,22 @@ int ObOptimizerUtil::is_lossless_column_cast(const ObRawExpr *expr, bool &is_los
           is_lossless = NUMBER_SCALE_UNKNOWN_YET == dst_type.get_scale()
                         && PRECISION_UNKNOWN_YET == dst_type.get_precision();
         }
+      } else if (ObCharType == child_type.get_type()) {
+        if (ObVarcharType == dst_type.get_type() && !expr->is_const_expr()) {
+          if ((dst_acc.get_length() >= child_type.get_accuracy().get_length() ||
+               dst_acc.get_length() == -1) &&
+              dst_type.get_obj_meta().get_collation_type() == child_type.get_obj_meta().get_collation_type()) {
+            is_lossless = true;
+          }
+        }
+      } else if (ObNCharType == child_type.get_type()) {
+        if (ObNVarchar2Type == dst_type.get_type() && !expr->is_const_expr()) {
+          if ((dst_acc.get_length() >= child_type.get_accuracy().get_length() ||
+               dst_acc.get_length() == -1) &&
+               dst_type.get_obj_meta().get_collation_type() == child_type.get_obj_meta().get_collation_type()) {
+            is_lossless = true;
+          }
+        }
       }
     }
     LOG_DEBUG("lossless column cast", K(child_type), K(child_tc), K(dst_type), K(dst_tc),