Merge pull request #15857 from taosdata/fix/TD-18259

fix: fix show stables in sysdb result error

source/libs/executor/src/scanoperator.c

@@ -2204,10 +2204,10 @@ static SSDataBlock* doSysTableScan(SOperatorInfo* pOperator) {
   // build message and send to mnode to fetch the content of system tables.
   SExecTaskInfo*     pTaskInfo = pOperator->pTaskInfo;
   SSysTableScanInfo* pInfo = pOperator->info;
+  char dbName[TSDB_DB_NAME_LEN] = {0};
 
   const char* name = tNameGetTableName(&pInfo->name);
   if (pInfo->showRewrite) {
-    char dbName[TSDB_DB_NAME_LEN] = {0};
     getDBNameFromCondition(pInfo->pCondition, dbName);
     sprintf(pInfo->req.db, "%d.%s", pInfo->accountId, dbName);
   }
@@ -2217,7 +2217,7 @@ static SSDataBlock* doSysTableScan(SOperatorInfo* pOperator) {
   } else if (strncasecmp(name, TSDB_INS_TABLE_TAGS, TSDB_TABLE_FNAME_LEN) == 0) {
     return sysTableScanUserTags(pOperator);
   } else if (strncasecmp(name, TSDB_INS_TABLE_STABLES, TSDB_TABLE_FNAME_LEN) == 0 &&
-             IS_SYS_DBNAME(pInfo->req.db)) {
+             pInfo->showRewrite && IS_SYS_DBNAME(dbName)) {
     return sysTableScanUserSTables(pOperator);
   } else {  // load the meta from mnode of the given epset
     if (pOperator->status == OP_EXEC_DONE) {