diff --git a/include/client/taos.h b/include/client/taos.h
index a22c8e5138..1d2b3a913c 100644
--- a/include/client/taos.h
+++ b/include/client/taos.h
@@ -366,7 +366,7 @@ typedef enum {
 } TSDB_SERVER_STATUS;
 
 DLL_EXPORT TSDB_SERVER_STATUS taos_check_server_status(const char *fqdn, int port, char *details, int maxlen);
-
+DLL_EXPORT char* getBuildInfo();
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/util/src/version.c.in b/source/util/src/version.c.in
index 2446bf9278..07bb1d42f8 100644
--- a/source/util/src/version.c.in
+++ b/source/util/src/version.c.in
@@ -5,3 +5,6 @@ char gitinfoOfInternal[48] = "${TD_VER_GIT_INTERNAL}";
 char buildinfo[64] = "${TD_VER_OSTYPE}-${TD_VER_CPUTYPE} ${TD_VER_DATE}";
 
 void libtaos_${TD_LIB_VER_NUMBER}_${TD_VER_OSTYPE}_${TD_VER_CPUTYPE}_${TD_VER_VERTYPE}() {};
+char* getBuildInfo(){
+    return buildinfo;
+}
diff --git a/utils/TSZ/sz/src/sz_double.c b/utils/TSZ/sz/src/sz_double.c
index 0510fc612d..7fe5a07843 100644
--- a/utils/TSZ/sz/src/sz_double.c
+++ b/utils/TSZ/sz/src/sz_double.c
@@ -385,11 +385,11 @@ unsigned int optimize_intervals_double_1D_opt(double *oriData, size_t dataLength
 		totalSampleSize++;
 		pred_value = data_pos[-1];
 		pred_err = fabs(pred_value - *data_pos);
-		double dbri = (unsigned long)((pred_err/realPrecision+1)/2);
+		double dbri = (pred_err/realPrecision+1)/2;
 		if(dbri >= (double)confparams_cpr->maxRangeRadius)
 			radiusIndex = confparams_cpr->maxRangeRadius - 1;
 		else
-		    radiusIndex = dbri;
+		    radiusIndex = (size_t)dbri;
 		intervals[radiusIndex]++;
 
 		data_pos += confparams_cpr->sampleDistance;
diff --git a/utils/TSZ/sz/src/sz_float.c b/utils/TSZ/sz/src/sz_float.c
index 4b18eb6ee8..e5dc40f003 100644
--- a/utils/TSZ/sz/src/sz_float.c
+++ b/utils/TSZ/sz/src/sz_float.c
@@ -53,9 +53,12 @@ unsigned int optimize_intervals_float_1D(float *oriData, size_t dataLength, doub
 			//pred_value = 2*oriData[i-1] - oriData[i-2];
 			pred_value = oriData[i-1];
 			pred_err = fabs(pred_value - oriData[i]);
-			radiusIndex = (unsigned long)((pred_err/realPrecision+1)/2);
-			if(radiusIndex>=confparams_cpr->maxRangeRadius)
-				radiusIndex = confparams_cpr->maxRangeRadius - 1;			
+			double dbri = (pred_err/realPrecision+1)/2;
+			if(dbri >= confparams_cpr->maxRangeRadius) {
+				radiusIndex = confparams_cpr->maxRangeRadius - 1;
+			} else {
+				radiusIndex = (size_t)dbri;
+			}
 			intervals[radiusIndex]++;
 		}
 	}
@@ -404,9 +407,12 @@ unsigned int optimize_intervals_float_1D_opt(float *oriData, size_t dataLength,
 		totalSampleSize++;
 		pred_value = data_pos[-1];
 		pred_err = fabs(pred_value - *data_pos);
-		radiusIndex = (unsigned long)((pred_err/realPrecision+1)/2);
-		if(radiusIndex>=confparams_cpr->maxRangeRadius)
-			radiusIndex = confparams_cpr->maxRangeRadius - 1;			
+		double dbri = (pred_err/realPrecision+1)/2;
+		if(dbri >= confparams_cpr->maxRangeRadius) {
+			radiusIndex = confparams_cpr->maxRangeRadius - 1;
+		} else {
+			radiusIndex = (size_t)dbri;
+		}
 		intervals[radiusIndex]++;
 
 		data_pos += confparams_cpr->sampleDistance;