diff --git a/tests/script/sh/abs_max.c b/tests/script/sh/abs_max.c
new file mode 100644
index 0000000000000000000000000000000000000000..430f364c514f461898379ccfb31e3ad63d8cb609
--- /dev/null
+++ b/tests/script/sh/abs_max.c
@@ -0,0 +1,87 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct SUdfInit{
+ int maybe_null;       /* 1 if function can return NULL */
+ int decimals;     /* for real functions */
+ long long length;       /* For string functions */
+ char  *ptr;            /* free pointer for function data */
+ int const_item;       /* 0 if result is independent of arguments */
+} SUdfInit;
+
+#define TSDB_DATA_INT_NULL              0x80000000L
+
+
+void abs_max(char* data, short itype, short ibytes, int numOfRows, long long* ts, char* dataOutput, char* interBuf, char* tsOutput,
+                        int* numOfOutput, short otype, short obytes, SUdfInit* buf) {
+   int i;
+   int r = 0;
+   printf("abs_max input data:%p, type:%d, rows:%d, ts:%p,%lld, dataoutput:%p, tsOutput:%p, numOfOutput:%p, buf:%p\n", data, itype, numOfRows, ts, *ts, dataOutput, tsOutput, numOfOutput, buf);
+   if (itype == 4) {
+     r=*(int *)dataOutput;
+     *numOfOutput=0;
+
+     for(i=0;i<numOfRows;++i) {
+       if (*((int *)data + i) == TSDB_DATA_INT_NULL) {
+         continue;
+       }
+
+       *numOfOutput=1;
+       int v = abs(*((int *)data + i));
+       if (v > r) {
+          r = v;
+       }
+     }
+
+     *(int *)dataOutput=r;
+
+     printf("abs_max out, dataoutput:%d, numOfOutput:%d\n", *(int *)dataOutput, *numOfOutput);
+   }
+}
+
+
+
+void abs_max_finalize(char* dataOutput, char* interBuf, int* numOfOutput, SUdfInit* buf) {
+   int i;
+   int r = 0;
+   printf("abs_max_finalize dataoutput:%p:%d, numOfOutput:%d, buf:%p\n", dataOutput, *dataOutput, *numOfOutput, buf);
+   *numOfOutput=1;
+   printf("abs_max finalize, dataoutput:%d, numOfOutput:%d\n", *(int *)dataOutput, *numOfOutput);
+}
+
+void abs_max_merge(char* data, int32_t numOfRows, char* dataOutput, int32_t* numOfOutput, SUdfInit* buf) {
+   int r = 0;
+   
+   if (numOfRows > 0) {
+      r = *((int*)data);
+   }
+   printf("abs_max_merge numOfRows:%d, dataoutput:%p, buf:%p\n", numOfRows, dataOutput, buf);
+   for (int i = 1; i < numOfRows; ++i) {
+     printf("abs_max_merge %d - %d\n", i, *((int*)data + i));
+     if (*((int*)data + i) > r) {
+        r= *((int*)data + i);
+     }
+   }
+   
+   *(int*)dataOutput=r;
+   if (numOfRows > 0) {
+     *numOfOutput=1;
+   } else {
+     *numOfOutput=0;
+   }
+   
+   printf("abs_max_merge, dataoutput:%d, numOfOutput:%d\n", *(int *)dataOutput, *numOfOutput);
+}
+
+
+int abs_max_init(SUdfInit* buf) {
+   printf("abs_max init\n");
+   return 0;
+}
+
+
+void abs_max_destroy(SUdfInit* buf) {
+   printf("abs_max destroy\n");
+}
+
diff --git a/tests/script/sh/prepare_udf.sh b/tests/script/sh/prepare_udf.sh
index a4619dc2e18e10ab2a987bfbabc675f10bd9fc81..ecfc53660ee33c65540638354c4f44119b76034d 100644
--- a/tests/script/sh/prepare_udf.sh
+++ b/tests/script/sh/prepare_udf.sh
@@ -9,3 +9,4 @@ rm -rf /tmp/sum_double.so /tmp/add_one.so
 gcc -g -O0 -fPIC -shared sh/sum_double.c -o /tmp/sum_double.so
 gcc -g -O0 -fPIC -shared sh/add_one.c -o /tmp/add_one.so
 gcc -g -O0 -fPIC -shared sh/demo.c -o /tmp/demo.so
+gcc -g -O0 -fPIC -shared sh/abs_max.c -o /tmp/abs_max.so