fix warning error

src/query/src/qAggMain.c

@@ -290,7 +290,7 @@ int32_t getResultDataInfo(int32_t dataType, int32_t dataBytes, int32_t functionI
     } else if (functionId == TSDB_FUNC_APERCT) {
       *type = TSDB_DATA_TYPE_BINARY;
       int16_t bytesHist = sizeof(SHistBin) * (MAX_HISTOGRAM_BIN + 1) + sizeof(SHistogramInfo) + sizeof(SAPercentileInfo);
-      int16_t bytesDigest = sizeof(SAPercentileInfo) + TDIGEST_SIZE(COMPRESSION);
+      int16_t bytesDigest = (int16_t)(sizeof(SAPercentileInfo) + TDIGEST_SIZE(COMPRESSION));
       *bytes = MAX(bytesHist, bytesDigest);
       *interBytes = *bytes;