fix: fix qworker destroy issue

source/libs/qworker/inc/qwInt.h

@@ -205,6 +205,7 @@ typedef struct SQWorker {
   SHashObj   *ctxHash;  // key: queryId+taskId, value: SQWTaskCtx
   SMsgCb      msgCb;
   SQWStat     stat;
+  int32_t    *destroyed;
 } SQWorker;
 
 typedef struct SQWorkerMgmt {

source/libs/qworker/src/qwUtil.c

@@ -485,6 +485,8 @@ void qwDestroyImpl(void *pMgmt) {
   }
   taosHashCleanup(mgmt->schHash);
 
+  *mgmt->destroyed = 1;
+  
   taosMemoryFree(mgmt);
 
   atomic_sub_fetch_32(&gQwMgmt.qwNum, 1);

source/libs/qworker/src/qworker.c

@@ -1114,10 +1114,17 @@ void qWorkerDestroy(void **qWorkerMgmt) {
     return;
   }
 
+  int32_t destroyed = 0;
   SQWorker *mgmt = *qWorkerMgmt;
+  mgmt->destroyed = &destroyed;
   
   if (taosRemoveRef(gQwMgmt.qwRef, mgmt->refId)) {
     qError("remove qw from ref list failed, refId:%" PRIx64, mgmt->refId);
+    return;
+  }
+
+  while (0 == destroyed) {
+    taosMsleep(2);
   }
 }