fix hll tsCountAlwaysReturnValue not working

source/libs/function/src/builtinsimpl.c

@@ -181,6 +181,7 @@ typedef enum { UNKNOWN_BIN = 0, USER_INPUT_BIN, LINEAR_BIN, LOG_BIN } EHistoBinT
 
 typedef struct SHLLFuncInfo {
   uint64_t result;
+  uint64_t totalCount;
   uint8_t  buckets[HLL_BUCKETS];
 } SHLLInfo;
 
@@ -4605,7 +4606,14 @@ int32_t hllFunction(SqlFunctionCtx* pCtx) {
     }
   }
 
-  SET_VAL(GET_RES_INFO(pCtx), numOfElems, 1);
+  pInfo->totalCount += numOfElems;
+
+  if (pInfo->totalCount == 0 && !tsCountAlwaysReturnValue) {
+    SET_VAL(GET_RES_INFO(pCtx), 0, 1);
+  } else {
+    SET_VAL(GET_RES_INFO(pCtx), 1, 1);
+  }
+
   return TSDB_CODE_SUCCESS;
 }
 
@@ -4615,6 +4623,7 @@ static void hllTransferInfo(SHLLInfo* pInput, SHLLInfo* pOutput) {
       pOutput->buckets[k] = pInput->buckets[k];
     }
   }
+  pOutput->totalCount += pInput->totalCount;
 }
 
 int32_t hllFunctionMerge(SqlFunctionCtx* pCtx) {
@@ -4632,7 +4641,12 @@ int32_t hllFunctionMerge(SqlFunctionCtx* pCtx) {
     hllTransferInfo(pInputInfo, pInfo);
   }
 
-  SET_VAL(GET_RES_INFO(pCtx), 1, 1);
+  if (pInfo->totalCount == 0 && !tsCountAlwaysReturnValue) {
+    SET_VAL(GET_RES_INFO(pCtx), 0, 1);
+  } else {
+    SET_VAL(GET_RES_INFO(pCtx), 1, 1);
+  }
+
   return TSDB_CODE_SUCCESS;
 }