fix error in mode function

src/query/src/qAggMain.c

@@ -5411,8 +5411,8 @@ int32_t functionCompatList[] = {
     1,          1,        1,         1,       -1,      1,          1,           1,          5,          1,      1,
     // tid_tag, deriv,    csum,       mavg,        sample,
     6,          8,        -1,         -1,          -1,
-    // block_info,elapsed,histogram,unique
-    7,          1,        -1,        -1
+    // block_info,elapsed,histogram,unique,mode
+    7,          1,        -1,        -1,      1
 };
 
 SAggFunctionInfo aAggs[TSDB_FUNC_MAX_NUM] = {{

src/query/src/qExecutor.c

@@ -3687,7 +3687,7 @@ void setDefaultOutputBuf(SQueryRuntimeEnv *pRuntimeEnv, SOptrBasicInfo *pInfo, i
     if (pCtx[i].functionId == TSDB_FUNC_UNIQUE) {
       pCtx[i].pUniqueSet = &pRow->uniqueHash;
     }else if (pCtx[i].functionId == TSDB_FUNC_MODE) {
-      pCtx[i].pUniqueSet = &pRow->modeHash;
+      pCtx[i].pModeSet = &pRow->modeHash;
     }
     pCtx[i].pOutput      = pData->pData;
     pCtx[i].currentStage = stage;
@@ -4026,7 +4026,7 @@ void setResultRowOutputBufInitCtx(SQueryRuntimeEnv *pRuntimeEnv, SResultRow *pRe
     if (pCtx[i].functionId == TSDB_FUNC_UNIQUE){
       pCtx[i].pUniqueSet = &pResult->uniqueHash;
     }else if (pCtx[i].functionId == TSDB_FUNC_MODE){
-      pCtx[i].pUniqueSet = &pResult->modeHash;
+      pCtx[i].pModeSet = &pResult->modeHash;
     }
 
     SResultRowCellInfo* pResInfo = pCtx[i].resultInfo;
@@ -4124,7 +4124,7 @@ void setResultOutputBuf(SQueryRuntimeEnv *pRuntimeEnv, SResultRow *pResult, SQLF
     if (pCtx[i].functionId == TSDB_FUNC_UNIQUE) {
       pCtx[i].pUniqueSet = &pResult->uniqueHash;
     }else if (pCtx[i].functionId == TSDB_FUNC_MODE) {
-      pCtx[i].pUniqueSet = &pResult->modeHash;
+      pCtx[i].pModeSet = &pResult->modeHash;
     }
   }
 }

src/query/src/qUtil.c

@@ -92,6 +92,10 @@ void cleanupResultRowInfo(SResultRowInfo *pResultRowInfo) {
         taosHashCleanup(pResultRowInfo->pResult[i]->uniqueHash);
         pResultRowInfo->pResult[i]->uniqueHash = NULL;
       }
+      if (pResultRowInfo->pResult[i]->modeHash){
+        taosHashCleanup(pResultRowInfo->pResult[i]->modeHash);
+        pResultRowInfo->pResult[i]->modeHash = NULL;
+      }
     }
   }