Merge pull request #13328 from taosdata/fix/TS-1579-V26

fix(delete): delete empty super table core

src/client/src/tscDelete.c

@@ -198,6 +198,10 @@ int32_t executeDelete(SSqlObj* pSql, SQueryInfo* pQueryInfo) {
   
   SSubqueryState *pState = &pSql->subState;
   int32_t numOfSub = pTableMetaInfo->vgroupList->numOfVgroups;
+  if(numOfSub == 0) {
+    tscInfo(":CDEL SQL:%p tablename=%s numOfVgroups is zero, maybe empty table.", pSql, pTableMetaInfo->name.tname);
+    return TSDB_CODE_FAILED;
+  }
 
   ret = doInitSubState(pSql, numOfSub);
   if (ret != 0) {

src/tsdb/src/tsdbDelete.c

@@ -125,7 +125,7 @@ static int tsdbDeleteImplCommon(STsdbRepo *pRepo, SControlDataInfo* pCtlInfo) {
     pRepo->deleteState = TSDB_NO_DELETE;
     tsem_post(&(pRepo->readyToCommit));
     tsdbInfo("vgId:%d :SDEL delete over, no meta or data file", REPO_ID(pRepo));
-    return -1;
+    return TSDB_CODE_SUCCESS;
   }
 
   SArray* aUpdates = taosArrayInit(10, sizeof(STable *));

tests/pytest/tsdb/delete.py

@@ -78,10 +78,16 @@ class TDTestCase:
     def create_tables(self):
         # super table
         tdSql.execute("create table st(ts timestamp, i1 int) tags(area int)")
+        # test delete empty super table
+        tdSql.execute("delete from st")
+
         # child table
         for i in range(10):
           sql = "create table t%d using st tags(%d)"%(i, i)
           tdSql.execute(sql)
+
+        # test delete empty table
+        tdSql.execute("delete from t0")
         
         return