diff --git a/src/pl/ob_pl.cpp b/src/pl/ob_pl.cpp
index 85fc1c5a96..f1d9f7464d 100644
--- a/src/pl/ob_pl.cpp
+++ b/src/pl/ob_pl.cpp
@@ -2873,7 +2873,11 @@ do {                                                                  \
             ObObj tmp;
             // CHARSET_ANY代表接受任何字符集,因此不能改变入参的字符集
             if (CS_TYPE_ANY == result_type.get_collation_type()) {
-              result_type.set_collation_type(params->at(i).get_meta().get_collation_type());
+              if (params->at(i).get_meta().is_string_or_lob_locator_type()) {
+                result_type.set_collation_type(params->at(i).get_meta().get_collation_type());
+              } else {
+                result_type.set_collation_type(ctx_.exec_ctx_->get_my_session()->get_nls_collation());
+              }
             }
             if ((result_type.is_blob() || result_type.is_blob_locator()
                  || params->at(i).is_blob() || params->at(i).is_blob_locator())
diff --git a/src/sql/engine/expr/ob_datum_cast.cpp b/src/sql/engine/expr/ob_datum_cast.cpp
index 0046555466..bbce1c6934 100644
--- a/src/sql/engine/expr/ob_datum_cast.cpp
+++ b/src/sql/engine/expr/ob_datum_cast.cpp
@@ -3324,7 +3324,12 @@ CAST_FUNC_NAME(text, raw)
       bool has_set_res = false;
       OZ(ObDatumHexUtils::hextoraw_string(expr, in_str, ctx, res_datum, has_set_res));
     } else { // blob to raw
-      res_datum.set_string(in_str.ptr(), in_str.length());
+      // empty blob treat as null in oracle
+      if (lib::is_oracle_mode() && in_str.length() == 0) {
+        res_datum.set_null();
+      } else {
+        res_datum.set_string(in_str.ptr(), in_str.length());
+      }
     }
   }
   return ret;
diff --git a/src/sql/resolver/ddl/ob_ddl_resolver.cpp b/src/sql/resolver/ddl/ob_ddl_resolver.cpp
index e04d2b3895..5cc06b8845 100644
--- a/src/sql/resolver/ddl/ob_ddl_resolver.cpp
+++ b/src/sql/resolver/ddl/ob_ddl_resolver.cpp
@@ -5359,6 +5359,9 @@ int ObDDLResolver::check_default_value(ObObj &default_value,
     } else if (column.is_xmltype() && ob_is_numeric_type(tmp_default_value.get_type())) {
       ret = OB_ERR_INVALID_XML_DATATYPE;
       LOG_WARN("incorrect cmp type with xml arguments",K(tmp_default_value.get_type()), K(ret));
+    } else if (lib::is_oracle_mode() && column.get_meta_type().is_blob() && ob_is_numeric_type(tmp_default_value.get_type())) {
+      ret = OB_ERR_INVALID_TYPE_FOR_OP;
+      LOG_WARN("inconsistent datatypes", "expected", data_type, "got", tmp_default_value.get_type(), K(ret));
     } else if(OB_FAIL(ObObjCaster::to_type(data_type, cast_ctx, tmp_default_value, tmp_dest_obj, tmp_res_obj))) {
       LOG_WARN("cast obj failed, ", "src type", tmp_default_value.get_type(), "dest type", data_type, K(tmp_default_value), K(ret));
     } else if (OB_ISNULL(tmp_res_obj)) {