diff --git a/deps/oblib/src/lib/udt/ob_collection_type.cpp b/deps/oblib/src/lib/udt/ob_collection_type.cpp
index 6a86f3f30..9a5aeeadb 100644
--- a/deps/oblib/src/lib/udt/ob_collection_type.cpp
+++ b/deps/oblib/src/lib/udt/ob_collection_type.cpp
@@ -445,7 +445,9 @@ int ObSqlCollectionInfo::parse_type_info()
       const auto& match = *it;
       std::string type_name = match.str();
       if (is_root) {
-        if (OB_FAIL(create_meta_info_by_name(type_name, collection_meta_, arr_depth))) {
+        // vector element is float
+        std::string root_elem = isNumber(type_name) ? "FLOAT" : type_name;
+        if (OB_FAIL(create_meta_info_by_name(root_elem, collection_meta_, arr_depth))) {
           LOG_WARN("get type by name failed", K(ret));
         } else {
           is_root = false;
@@ -497,12 +499,16 @@ bool ObSqlCollectionInfo::has_same_super_type(const ObSqlCollectionInfo &other)
 int ObSqlCollectionInfo::get_child_def_string(ObString &child_def) const
 {
   int ret = OB_SUCCESS;
-  const uint32_t min_len = 7; // array()
-  if (name_len_ <= min_len) {
+  if (name_len_ <= 7) { // array()
     ret = OB_INVALID_ARGUMENT;
     LOG_WARN("invalid argument", K(ret), K(*this));
+  } else if (ObString(6, name_def_).compare("ARRAY(") == 0) {
+    child_def = ObString(name_len_ - 7, name_def_ + 6);
+  } else if (ObString(7, name_def_).compare("VECTOR(") == 0) {
+    child_def = ObString(name_len_ - 8, name_def_ + 7);
   } else {
-    child_def = ObString(name_len_ - min_len, name_def_ + (min_len - 1));
+    ret = OB_INVALID_ARGUMENT;
+    LOG_WARN("invalid argument", K(ret), K(*this));
   }
   return ret;
 }
diff --git a/src/sql/engine/expr/ob_array_cast.cpp b/src/sql/engine/expr/ob_array_cast.cpp
index 4ef366004..a102ed288 100644
--- a/src/sql/engine/expr/ob_array_cast.cpp
+++ b/src/sql/engine/expr/ob_array_cast.cpp
@@ -544,7 +544,8 @@ int ObArrayTypeCastFactory::alloc(ObIAllocator &alloc, const ObCollectionTypeBas
     } else {
       arr_cast = OB_NEWx(ObArrayFixedSizeCast, &alloc);
     }
-  } else if (arr_type->element_type_->type_id_ == ObNestedType::OB_ARRAY_TYPE) {
+  } else if (arr_type->element_type_->type_id_ == ObNestedType::OB_ARRAY_TYPE
+             || arr_type->element_type_->type_id_ == ObNestedType::OB_VECTOR_TYPE) {
     arr_cast = OB_NEWx(ObArrayNestedCast, &alloc);
   } else {
     // to do
diff --git a/src/sql/engine/expr/ob_expr_array_append.cpp b/src/sql/engine/expr/ob_expr_array_append.cpp
index 303a7e56c..8c6c4540b 100644
--- a/src/sql/engine/expr/ob_expr_array_append.cpp
+++ b/src/sql/engine/expr/ob_expr_array_append.cpp
@@ -349,7 +349,8 @@ int ObExprArrayAppendCommon::append_elem(ObIAllocator &tmp_allocator, ObEvalCtx
     if (OB_FAIL(ObArrayUtil::append(*res_arr, elem_type->basic_meta_.get_obj_type(), val_datum))) {
       LOG_WARN("failed to append array value", K(ret));
     }
-  } else if (arr_type->element_type_->type_id_ == ObNestedType::OB_ARRAY_TYPE) {
+  } else if (arr_type->element_type_->type_id_ == ObNestedType::OB_ARRAY_TYPE
+             || arr_type->element_type_->type_id_ == ObNestedType::OB_VECTOR_TYPE) {
     bool is_null_elem = val_datum->is_null();
     if (!is_null_elem && OB_FAIL(ObArrayExprUtils::get_array_obj(tmp_allocator, ctx, val_subschema_id, val_datum->get_string(), val_arr))) {
       LOG_WARN("construct array obj failed", K(ret));
@@ -357,8 +358,8 @@ int ObExprArrayAppendCommon::append_elem(ObIAllocator &tmp_allocator, ObEvalCtx
       LOG_WARN("failed to append array", K(ret));
     }
   } else {
-    ret = OB_NOT_SUPPORTED;
-    OB_LOG(WARN, "invalid array type", K(ret), K(arr_type->element_type_->type_id_));
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("invalid element type", K(ret), K(arr_type->element_type_->type_id_));
   }
   return ret;
 }
@@ -384,7 +385,8 @@ int ObExprArrayAppendCommon::append_elem_vector(ObIAllocator &tmp_allocator, ObE
     if (OB_FAIL(ObArrayUtil::append(*res_arr, elem_type->basic_meta_.get_obj_type(), &val_datum))) {
       LOG_WARN("failed to append array value", K(ret));
     }
-  } else if (arr_type->element_type_->type_id_ == ObNestedType::OB_ARRAY_TYPE) {
+  } else if (arr_type->element_type_->type_id_ == ObNestedType::OB_ARRAY_TYPE
+             || arr_type->element_type_->type_id_ == ObNestedType::OB_VECTOR_TYPE) {
     bool is_null_elem = val_vec->is_null(idx);
     if (is_null_elem) {
       // do nothing
@@ -400,8 +402,8 @@ int ObExprArrayAppendCommon::append_elem_vector(ObIAllocator &tmp_allocator, ObE
       LOG_WARN("failed to append array", K(ret));
     }
   } else {
-    ret = OB_NOT_SUPPORTED;
-    OB_LOG(WARN, "invalid array type", K(ret), K(arr_type->element_type_->type_id_));
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("invalid element type", K(ret), K(arr_type->element_type_->type_id_));
   }
   return ret;
 }
diff --git a/src/sql/engine/expr/ob_expr_element_at.cpp b/src/sql/engine/expr/ob_expr_element_at.cpp
index 44fc8506a..fd8713eee 100644
--- a/src/sql/engine/expr/ob_expr_element_at.cpp
+++ b/src/sql/engine/expr/ob_expr_element_at.cpp
@@ -69,7 +69,8 @@ int ObExprElementAt::calc_result_type2(ObExprResType &type,
       ObCollectionBasicType *elem_type = static_cast<ObCollectionBasicType *>(arr_type->element_type_);
       type.set_meta(elem_type->basic_meta_.get_meta_type());
       type.set_accuracy(elem_type->basic_meta_.get_accuracy());
-    } else if (arr_type->element_type_->type_id_ == ObNestedType::OB_ARRAY_TYPE) {
+    } else if (arr_type->element_type_->type_id_ == ObNestedType::OB_ARRAY_TYPE
+               || arr_type->element_type_->type_id_ == ObNestedType::OB_VECTOR_TYPE) {
       ObString child_def;
       uint16_t child_subschema_id = 0;
       if (OB_FAIL(coll_info->get_child_def_string(child_def))) {
@@ -79,8 +80,6 @@ int ObExprElementAt::calc_result_type2(ObExprResType &type,
       } else {
         type.set_collection(child_subschema_id);
       }
-    } else if (arr_type->element_type_->type_id_ == ObNestedType::OB_VECTOR_TYPE) {
-      type.set_float();
     } else {
       ret = OB_ERR_UNEXPECTED;
       LOG_WARN("unexpected ObNestedType type", K(ret), K(arr_type->element_type_->type_id_));
@@ -132,7 +131,8 @@ int ObExprElementAt::eval_element_at(const ObExpr &expr, ObEvalCtx &ctx, ObDatum
     } else {
       res.from_obj(elem_obj);
     }
-  } else if (arr_type->element_type_->type_id_ == ObNestedType::OB_ARRAY_TYPE) {
+  } else if (arr_type->element_type_->type_id_ == ObNestedType::OB_ARRAY_TYPE
+             || arr_type->element_type_->type_id_ == ObNestedType::OB_VECTOR_TYPE) {
     uint16_t child_subschema_id = expr.obj_meta_.get_subschema_id();
     ObIArrayType* child_arr = NULL;
     ObString child_arr_str;
@@ -145,9 +145,6 @@ int ObExprElementAt::eval_element_at(const ObExpr &expr, ObEvalCtx &ctx, ObDatum
     } else {
       res.set_string(child_arr_str);
     }
-  } else if (arr_type->element_type_->type_id_ == ObNestedType::OB_VECTOR_TYPE) {
-    float *vector_data = reinterpret_cast<float*>(src_arr->get_data());
-    res.set_float(vector_data[idx]);
   } else {
     ret = OB_ERR_UNEXPECTED;
     LOG_WARN("invalid element type", K(ret), K(arr_type->element_type_->type_id_));
@@ -215,7 +212,8 @@ int ObExprElementAt::eval_element_at_batch(const ObExpr &expr, ObEvalCtx &ctx,
         } else {
           res_datum.at(j)->from_obj(elem_obj);
         }
-      } else if (arr_type->element_type_->type_id_ == ObNestedType::OB_ARRAY_TYPE) {
+      } else if (arr_type->element_type_->type_id_ == ObNestedType::OB_ARRAY_TYPE
+                 || arr_type->element_type_->type_id_ == ObNestedType::OB_VECTOR_TYPE) {
         uint16_t child_subschema_id = expr.obj_meta_.get_subschema_id();
         ObString child_arr_str;
         if (OB_FAIL(ObArrayExprUtils::construct_array_obj(tmp_allocator,ctx, child_subschema_id, child_arr, false))) {
@@ -243,9 +241,6 @@ int ObExprElementAt::eval_element_at_batch(const ObExpr &expr, ObEvalCtx &ctx,
             output_result.set_result();
           }
         }
-      } else if (arr_type->element_type_->type_id_ == ObNestedType::OB_VECTOR_TYPE) {
-        float *vector_data = reinterpret_cast<float*>(src_arr->get_data());
-        res_datum.at(j)->set_float(vector_data[idx]);
       } else {
         ret = OB_ERR_UNEXPECTED;
         LOG_WARN("invalid element type", K(ret), K(arr_type->element_type_->type_id_));
@@ -340,7 +335,8 @@ int ObExprElementAt::eval_element_at_vector(const ObExpr &expr, ObEvalCtx &ctx,
           ret = OB_ERR_UNEXPECTED;
           OB_LOG(WARN, "unexpected element type", K(ret), K(elem_obj.get_type()));
         }
-      } else if (arr_type->element_type_->type_id_ == ObNestedType::OB_ARRAY_TYPE) {
+      } else if (arr_type->element_type_->type_id_ == ObNestedType::OB_ARRAY_TYPE
+                 || arr_type->element_type_->type_id_ == ObNestedType::OB_VECTOR_TYPE) {
         uint16_t child_subschema_id = expr.obj_meta_.get_subschema_id();
         ObString child_arr_str;
         if (OB_FAIL(ObArrayExprUtils::construct_array_obj(tmp_allocator,ctx, child_subschema_id, child_arr, false))) {
@@ -359,9 +355,6 @@ int ObExprElementAt::eval_element_at_vector(const ObExpr &expr, ObEvalCtx &ctx,
         } else if (OB_FAIL(ObArrayExprUtils::set_array_res<ObVectorBase>(child_arr, expr, ctx, static_cast<ObVectorBase *>(res_vec), idx))) {
           LOG_WARN("set array res failed", K(ret));
         }
-      } else if (arr_type->element_type_->type_id_ == ObNestedType::OB_VECTOR_TYPE) {
-        float *vector_data = reinterpret_cast<float*>(src_arr->get_data());
-        res_vec->set_float(idx, vector_data[arr_idx]);
       } else {
         ret = OB_ERR_UNEXPECTED;
         LOG_WARN("invalid element type", K(ret), K(arr_type->element_type_->type_id_));
diff --git a/src/sql/resolver/dml/ob_dml_resolver.cpp b/src/sql/resolver/dml/ob_dml_resolver.cpp
index 6082ea151..15f9fa239 100755
--- a/src/sql/resolver/dml/ob_dml_resolver.cpp
+++ b/src/sql/resolver/dml/ob_dml_resolver.cpp
@@ -5575,7 +5575,8 @@ int ObDMLResolver::unnest_table_add_column(TableItem *&table_item, ColumnItem *&
       if (arr_type->element_type_->type_id_ == ObNestedType::OB_BASIC_TYPE) {
         ObCollectionBasicType *elem_type = static_cast<ObCollectionBasicType *>(arr_type->element_type_);
         data_type = elem_type->basic_meta_;
-      } else if (arr_type->element_type_->type_id_ == ObNestedType::OB_ARRAY_TYPE) {
+      } else if (arr_type->element_type_->type_id_ == ObNestedType::OB_ARRAY_TYPE
+                 || arr_type->element_type_->type_id_ == ObNestedType::OB_VECTOR_TYPE) {
         ObString child_def;
         uint16_t child_subschema_id = 0;
         if (OB_FAIL(coll_info->get_child_def_string(child_def))) {
@@ -5588,8 +5589,8 @@ int ObDMLResolver::unnest_table_add_column(TableItem *&table_item, ColumnItem *&
           data_type.set_subschema_id(child_subschema_id);
         }
       } else {
-        ret = OB_NOT_SUPPORTED;
-        LOG_WARN("not supportted array data type provided.", K(ret), K(arr_type->element_type_->type_id_));
+        ret = OB_ERR_UNEXPECTED;
+        LOG_WARN("invalid element type", K(ret), K(arr_type->element_type_->type_id_));
       }
     }
   }