vector_distance expr placeholder

src/objit/include/objit/common/ob_item_type.h

@@ -861,6 +861,7 @@ typedef enum ObItemType
   T_FUN_SYS_COSINE_DISTANCE = 1741,
   T_FUN_SYS_VECTOR_DIMS = 1742,
   T_FUN_SYS_VECTOR_NORM = 1743,
+  T_FUN_SYS_VECTOR_DISTANCE = 1744,
   ///< @note add new oracle only function type before this line
 
   T_FUN_SYS_TABLET_AUTOINC_NEXTVAL = 1801, // add only for heap table

src/sql/engine/expr/ob_expr_eval_functions.cpp

@@ -1206,6 +1206,7 @@ static ObExpr::EvalFunc g_expr_eval_functions[] = {
   NULL, // ObExprVectorIPDistance::calc_inner_product,                /* 724 */
   NULL, // ObExprVectorDims::calc_dims,                               /* 725 */
   NULL, // ObExprVectorNorm::calc_norm,                               /* 726 */
+  NULL, // ObExprVectorDistance::calc_distance,                       /* 727 */
 };
 
 static ObExpr::EvalBatchFunc g_expr_eval_batch_functions[] = {