fix: fix ucs4 convertion issue

include/os/osString.h

@@ -62,6 +62,8 @@ typedef int32_t TdUcs4;
 int32_t taosUcs4len(TdUcs4 *ucs4);
 int64_t taosStr2int64(const char *str);
 
+int32_t taosConvInit(int32_t maxNum);
+void    taosConvDestroy();
 int32_t taosUcs4ToMbs(TdUcs4 *ucs4, int32_t ucs4_max_len, char *mbs);
 bool    taosMbsToUcs4(const char *mbs, size_t mbs_len, TdUcs4 *ucs4, int32_t ucs4_max_len, int32_t *len);
 int32_t tasoUcs4Compare(TdUcs4 *f1_ucs4, TdUcs4 *f2_ucs4, int32_t bytes);

source/client/src/clientEnv.c

@@ -361,6 +361,8 @@ void taos_init_imp(void) {
 
   initQueryModuleMsgHandle();
 
+  taosConvInit(256);
+  
   rpcInit();
 
   SCatalogCfg cfg = {.maxDBCacheNum = 100, .maxTblCacheNum = 100};

source/client/src/clientHb.c

@@ -353,6 +353,7 @@ int32_t hbBuildQueryDesc(SQueryHbReqBasic *hbBasic, STscObj *pObj) {
         desc.subDesc = NULL;
         desc.subPlanNum = 0;
       }
+      desc.subPlanNum = taosArrayGetSize(desc.subDesc);
       ASSERT(desc.subPlanNum == taosArrayGetSize(desc.subDesc));
     } else {
       desc.subDesc = NULL;

source/client/src/clientMain.c

@@ -75,6 +75,8 @@ void taos_cleanup(void) {
 
   cleanupTaskQueue();
 
+  taosConvDestroy();
+  
   tscInfo("all local resources released");
   taosCleanupCfg();
   taosCloseLog();

source/libs/scheduler/src/schJob.c

@@ -278,7 +278,7 @@ int32_t schValidateAndBuildJob(SQueryPlan *pDag, SSchJob *pJob) {
   }
 
   SHashObj *planToTask = taosHashInit(
-      SCHEDULE_DEFAULT_MAX_TASK_NUM,
+      pDag->numOfSubplans,
       taosGetDefaultHashFunction(POINTER_BYTES == sizeof(int64_t) ? TSDB_DATA_TYPE_BIGINT : TSDB_DATA_TYPE_INT), false,
       HASH_NO_LOCK);
   if (NULL == planToTask) {

source/os/src/osString.c

@@ -134,21 +134,81 @@ int32_t taosUcs4ToMbs(TdUcs4 *ucs4, int32_t ucs4_max_len, char *mbs) {
 #endif
 }
 
+typedef struct {
+  iconv_t conv;
+  int8_t  inUse;
+} SConv;
+
+SConv *gConv = NULL;
+int32_t convUsed = 0;
+int32_t gConvMaxNum = 0;
+
+int32_t taosConvInit(int32_t maxNum) {
+  gConvMaxNum = maxNum * 2;
+  gConv = taosMemoryCalloc(gConvMaxNum, sizeof(SConv));
+  for (int32_t i = 0; i < gConvMaxNum; ++i) {
+    gConv[i].conv = iconv_open(DEFAULT_UNICODE_ENCODEC, tsCharset);
+  }
+
+  return 0;
+}
+
+void taosConvDestroy() {
+  for (int32_t i = 0; i < gConvMaxNum; ++i) {
+    iconv_close(gConv[i].conv);
+  }
+  taosMemoryFreeClear(gConv);
+}
+
+void taosAcquireConv(int32_t *idx) {
+  while (true) {
+    int32_t used = atomic_add_fetch_32(&convUsed, 1);
+    if (used > gConvMaxNum) {
+      used = atomic_sub_fetch_32(&convUsed, 1);
+      sched_yield();
+      continue;
+    }
+    
+    break;
+  }
+
+  int32_t startId = taosGetSelfPthreadId() % gConvMaxNum;
+  while (true) {
+    if (gConv[startId].inUse) {
+      startId = (startId + 1) % gConvMaxNum;
+      continue;
+    }
+
+    int8_t old = atomic_val_compare_exchange_8(&gConv[startId].inUse, 0, 1);
+    if (0 == old) {
+      break;
+    }
+  }
+
+  *idx = startId;
+}
+
+void taosReleaseConv(int32_t idx) {
+  atomic_store_8(&gConv[idx].inUse, 0);
+}
+
 bool taosMbsToUcs4(const char *mbs, size_t mbsLength, TdUcs4 *ucs4, int32_t ucs4_max_len, int32_t *len) {
 #ifdef DISALLOW_NCHAR_WITHOUT_ICONV
   printf("Nchar cannot be read and written without iconv, please install iconv library and recompile TDengine.\n");
   return -1;
 #else
   memset(ucs4, 0, ucs4_max_len);
-  iconv_t cd = iconv_open(DEFAULT_UNICODE_ENCODEC, tsCharset);
+
+  int32_t idx = 0;
+  taosAcquireConv(&idx);
   size_t  ucs4_input_len = mbsLength;
   size_t  outLeft = ucs4_max_len;
-  if (iconv(cd, (char **)&mbs, &ucs4_input_len, (char **)&ucs4, &outLeft) == -1) {
-    iconv_close(cd);
+  if (iconv(gConv[idx].conv, (char **)&mbs, &ucs4_input_len, (char **)&ucs4, &outLeft) == -1) {
+    taosReleaseConv(idx);
     return false;
   }
 
-  iconv_close(cd);
+  taosReleaseConv(idx);
   if (len != NULL) {
     *len = (int32_t)(ucs4_max_len - outLeft);
     if (*len < 0) {