fix: refactor doInitSubState to doReInitSubState with old pSubs reset properly

src/client/inc/tscUtil.h

@@ -350,7 +350,7 @@ void doAddGroupColumnForSubquery(SQueryInfo* pQueryInfo, int32_t tagIndex, SSqlC
 
 int16_t tscGetJoinTagColIdByUid(STagCond* pTagCond, uint64_t uid);
 int16_t tscGetTagColIndexById(STableMeta* pTableMeta, int16_t colId);
-int32_t doInitSubState(SSqlObj* pSql, int32_t numOfSubqueries);
+int32_t doReInitSubState(SSqlObj* pSql, int32_t numOfSubqueries);
 
 void tscPrintSelNodeList(SSqlObj* pSql, int32_t subClauseIndex);
 

src/client/src/tscDelete.c

@@ -202,7 +202,7 @@ int32_t executeDelete(SSqlObj* pSql, SQueryInfo* pQueryInfo) {
     return TSDB_CODE_FAILED;
   }
 
-  ret = doInitSubState(pSql, numOfSub);
+  ret = doReInitSubState(pSql, numOfSub);
   if (ret != 0) {
     tscAsyncResultOnError(pSql);
     return ret;

src/client/src/tscSubquery.c

@@ -2175,20 +2175,19 @@ void tscHandleMasterJoinQuery(SSqlObj* pSql) {
   assert((pQueryInfo->type & TSDB_QUERY_TYPE_SUBQUERY) == 0);
 
   int32_t code = TSDB_CODE_SUCCESS;
-  pSql->subState.numOfSub = pQueryInfo->numOfTables;
 
+  pthread_mutex_lock(&pSql->subState.mutex);
+  pSql->subState.numOfSub = pQueryInfo->numOfTables;
   if (pSql->subState.states == NULL) {
     pSql->subState.states = calloc(pSql->subState.numOfSub, sizeof(*pSql->subState.states));
     if (pSql->subState.states == NULL) {
       code = TSDB_CODE_TSC_OUT_OF_MEMORY;
       goto _error;
     }
-    
-    pthread_mutex_init(&pSql->subState.mutex, NULL);
   }
-
   memset(pSql->subState.states, 0, sizeof(*pSql->subState.states) * pSql->subState.numOfSub);
   tscDebug("0x%"PRIx64" reset all sub states to 0, start subquery, total:%d", pSql->self, pQueryInfo->numOfTables);
+  pthread_mutex_unlock(&pSql->subState.mutex);
 
   for (int32_t i = 0; i < pQueryInfo->numOfTables; ++i) {
     SJoinSupporter *pSupporter = tscCreateJoinSupporter(pSql, i);
@@ -2760,8 +2759,7 @@ int32_t tscHandleMasterSTableQuery(SSqlObj *pSql) {
 
   int32_t numOfSub = (pTableMetaInfo->pVgroupTables == NULL) ? pTableMetaInfo->vgroupList->numOfVgroups
                                                              : (int32_t)taosArrayGetSize(pTableMetaInfo->pVgroupTables);
-
-  int32_t ret = doInitSubState(pSql, numOfSub);
+  int32_t ret = doReInitSubState(pSql, numOfSub);
   if (ret != 0) {
     tscAsyncResultOnError(pSql);
     return ret;
@@ -3611,7 +3609,6 @@ int32_t tscHandleMultivnodeInsert(SSqlObj *pSql) {
     tscDebug("0x%"PRIx64" sub:%p launch sub insert, orderOfSub:%d", pSql->self, pSub, j);
     tscBuildAndSendRequest(pSub, NULL);
   }
-
   return TSDB_CODE_SUCCESS;
 
   _error:

src/client/src/tscUtil.c

@@ -4207,30 +4207,19 @@ static void tscSubqueryCompleteCallback(void* param, TAOS_RES* tres, int code) {
   taos_fetch_rows_a(tres, tscSubqueryRetrieveCallback, param);
 }
 
-int32_t doInitSubState(SSqlObj* pSql, int32_t numOfSubqueries) {
-  //bug fix. Above doInitSubState level, the loop invocation with the same SSqlObj will be fail.
-  //assert(pSql->subState.numOfSub == 0 && pSql->pSubs == NULL && pSql->subState.states == NULL);  
-  if(pSql->pSubs) {
-    free(pSql->pSubs);
-    pSql->pSubs = NULL;
-  }
-  
-  if(pSql->subState.states) {
-    free(pSql->subState.states);
-    pSql->subState.states = NULL;
-  }
+int32_t doReInitSubState(SSqlObj* pSql, int32_t numOfSubqueries) {
+  tscFreeSubobj(pSql);
 
+  pthread_mutex_lock(&pSql->subState.mutex);
+  int32_t code = TSDB_CODE_SUCCESS;
   pSql->subState.numOfSub = numOfSubqueries;
-  
   pSql->pSubs = calloc(pSql->subState.numOfSub, POINTER_BYTES);
   pSql->subState.states = calloc(pSql->subState.numOfSub, sizeof(int8_t));
-
-  int32_t code = pthread_mutex_init(&pSql->subState.mutex, NULL);
-  if (pSql->pSubs == NULL || pSql->subState.states == NULL || code != 0) {
-    return TSDB_CODE_TSC_OUT_OF_MEMORY;
+  if (pSql->pSubs == NULL || pSql->subState.states == NULL) {
+    code = TSDB_CODE_TSC_OUT_OF_MEMORY;
   }
-
-  return TSDB_CODE_SUCCESS;
+  pthread_mutex_unlock(&pSql->subState.mutex);
+  return code;
 }
 
 // do execute the query according to the query execution plan
@@ -4255,7 +4244,7 @@ void executeQuery(SSqlObj* pSql, SQueryInfo* pQueryInfo) {
 
   // upstream may be freed before retry
   if (pQueryInfo->pUpstream && taosArrayGetSize(pQueryInfo->pUpstream) > 0) {  // nest query. do execute it firstly
-    code = doInitSubState(pSql, (int32_t) taosArrayGetSize(pQueryInfo->pUpstream));
+    code = doReInitSubState(pSql, (int32_t) taosArrayGetSize(pQueryInfo->pUpstream));
     if (code != TSDB_CODE_SUCCESS) {
       goto _error;
     }