[td-255] fix compiler error.

src/query/src/qAggMain.c

@@ -344,7 +344,7 @@ 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));
+      int32_t bytesDigest = (int32_t) (sizeof(SAPercentileInfo) + TDIGEST_SIZE(COMPRESSION));
       *bytes = MAX(bytesHist, bytesDigest);
       *interBytes = *bytes;
       
@@ -379,7 +379,7 @@ int32_t getResultDataInfo(int32_t dataType, int32_t dataBytes, int32_t functionI
     *type = TSDB_DATA_TYPE_DOUBLE;
     *bytes = sizeof(double);
     int16_t bytesHist = sizeof(SAPercentileInfo) + sizeof(SHistogramInfo) + sizeof(SHistBin) * (MAX_HISTOGRAM_BIN + 1);
-    int16_t bytesDigest = (sizeof(SAPercentileInfo) + TDIGEST_SIZE(COMPRESSION));
+    int32_t bytesDigest = (int32_t) (sizeof(SAPercentileInfo) + TDIGEST_SIZE(COMPRESSION));
     *interBytes = MAX(bytesHist, bytesDigest);
     return TSDB_CODE_SUCCESS;
   } else if (functionId == TSDB_FUNC_TWA) {