fix: dedicated max privileges rows to 2048

source/dnode/mnode/impl/src/mndShow.c

@@ -20,6 +20,7 @@
 
 #define SHOW_STEP_SIZE 100
 #define SHOW_COLS_STEP_SIZE 4096
+#define SHOW_PRIVILEGES_STEP_SIZE 2048
 
 static SShowObj *mndCreateShowObj(SMnode *pMnode, SRetrieveTableReq *pReq);
 static void      mndFreeShowObj(SShowObj *pShow);
@@ -232,8 +233,10 @@ static int32_t mndProcessRetrieveSysTableReq(SRpcMsg *pReq) {
     }
   }
 
-  if(pShow->type == TSDB_MGMT_TABLE_COL || pShow->type == TSDB_MGMT_TABLE_PRIVILEGES){   // expend capacity for ins_columns
+  if(pShow->type == TSDB_MGMT_TABLE_COL){   // expend capacity for ins_columns
     rowsToRead = SHOW_COLS_STEP_SIZE;
+  } else if (pShow->type == TSDB_MGMT_TABLE_PRIVILEGES) {
+    rowsToRead = SHOW_PRIVILEGES_STEP_SIZE;
   }
   ShowRetrieveFp retrieveFp = pMgmt->retrieveFps[pShow->type];
   if (retrieveFp == NULL) {