fix(query): fix invalid write in distinct query.

source/libs/executor/src/executorimpl.c

@@ -5615,7 +5615,7 @@ int32_t doInitAggInfoSup(SAggSupporter* pAggSup, SqlFunctionCtx* pCtx, int32_t n
   _hash_fn_t hashFn = taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY);
 
   pAggSup->resultRowSize       = getResultRowSize(pCtx, numOfOutput);
-  pAggSup->keyBuf              = taosMemoryCalloc(1, keyBufSize);
+  pAggSup->keyBuf              = taosMemoryCalloc(1, keyBufSize + POINTER_BYTES + sizeof(int64_t));
   pAggSup->pResultRowHashTable = taosHashInit(10, hashFn, true, HASH_NO_LOCK);
   pAggSup->pResultRowListSet   = taosHashInit(100, hashFn, false, HASH_NO_LOCK);
   pAggSup->pResultRowArrayList = taosArrayInit(10, sizeof(SResultRowCell));