diff --git a/include/libs/function/taosudf.h b/include/libs/function/taosudf.h
index 04b92a897a..0b59d7c2f5 100644
--- a/include/libs/function/taosudf.h
+++ b/include/libs/function/taosudf.h
@@ -320,6 +320,30 @@ typedef int32_t (*TScriptUdfDestoryFunc)(void *udfCtx);
 typedef int32_t (*TScriptOpenFunc)(SScriptUdfEnvItem *items, int numItems);
 typedef int32_t (*TScriptCloseFunc)();
 
+// clang-format off
+#ifdef WINDOWS
+  #define fnFatal(...) {}
+  #define fnError(...) {}
+  #define fnWarn(...)  {}
+  #define fnInfo(...)  {}
+  #define fnDebug(...) {}
+  #define fnTrace(...) {}
+#else
+  DLL_EXPORT void taosPrintLog(const char *flags, int32_t level, int32_t dflag, const char *format, ...)
+#ifdef __GNUC__
+    __attribute__((format(printf, 4, 5)))
+#endif
+    ;
+  extern int32_t udfDebugFlag;
+  #define udfFatal(...) { if (udfDebugFlag & 1) { taosPrintLog("UDF FATAL ", 1, 255, __VA_ARGS__); }}
+  #define udfError(...) { if (udfDebugFlag & 1) { taosPrintLog("UDF ERROR ", 1, 255, __VA_ARGS__); }}
+  #define udfWarn(...)  { if (udfDebugFlag & 2) { taosPrintLog("UDF WARN ",  2, 255, __VA_ARGS__); }}
+  #define udfInfo(...)  { if (udfDebugFlag & 2) { taosPrintLog("UDF ",       2, 255, __VA_ARGS__); }}
+  #define udfDebug(...) { if (udfDebugFlag & 4) { taosPrintLog("UDF ",       4, udfDebugFlag, __VA_ARGS__); }}
+  #define udfTrace(...) { if (udfDebugFlag & 8) { taosPrintLog("UDF ",       8, udfDebugFlag, __VA_ARGS__); }}
+#endif
+// clang-format on
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/include/util/tlog.h b/include/util/tlog.h
index 67aafbfe44..b4dbbef532 100644
--- a/include/util/tlog.h
+++ b/include/util/tlog.h
@@ -74,13 +74,13 @@ void    taosCloseLog();
 void    taosResetLog();
 void    taosDumpData(uint8_t *msg, int32_t len);
 
-void taosPrintLog(const char *flags, ELogLevel level, int32_t dflag, const char *format, ...)
+void taosPrintLog(const char *flags, int32_t level, int32_t dflag, const char *format, ...)
 #ifdef __GNUC__
     __attribute__((format(printf, 4, 5)))
 #endif
     ;
 
-void taosPrintLongString(const char *flags, ELogLevel level, int32_t dflag, const char *format, ...)
+void taosPrintLongString(const char *flags, int32_t level, int32_t dflag, const char *format, ...)
 #ifdef __GNUC__
     __attribute__((format(printf, 4, 5)))
 #endif
diff --git a/source/util/src/tlog.c b/source/util/src/tlog.c
index 1946a0a274..86dc767adc 100644
--- a/source/util/src/tlog.c
+++ b/source/util/src/tlog.c
@@ -567,7 +567,7 @@ static inline void taosPrintLogImp(ELogLevel level, int32_t dflag, const char *b
   }
 }
 
-void taosPrintLog(const char *flags, ELogLevel level, int32_t dflag, const char *format, ...) {
+void taosPrintLog(const char *flags, int32_t level, int32_t dflag, const char *format, ...) {
   if (!(dflag & DEBUG_FILE) && !(dflag & DEBUG_SCREEN)) return;
 
   char    buffer[LOG_MAX_LINE_BUFFER_SIZE];
@@ -590,7 +590,7 @@ void taosPrintLog(const char *flags, ELogLevel level, int32_t dflag, const char
   }
 }
 
-void taosPrintLongString(const char *flags, ELogLevel level, int32_t dflag, const char *format, ...) {
+void taosPrintLongString(const char *flags, int32_t level, int32_t dflag, const char *format, ...) {
   if (!osLogSpaceAvailable()) return;
   if (!(dflag & DEBUG_FILE) && !(dflag & DEBUG_SCREEN)) return;
 
diff --git a/tests/script/sh/bit_and.c b/tests/script/sh/bit_and.c
index f3bf71ce94..2cf2157e1c 100644
--- a/tests/script/sh/bit_and.c
+++ b/tests/script/sh/bit_and.c
@@ -8,13 +8,17 @@ DLL_EXPORT int32_t bit_and_init() { return 0; }
 DLL_EXPORT int32_t bit_and_destroy() { return 0; }
 
 DLL_EXPORT int32_t bit_and(SUdfDataBlock* block, SUdfColumn* resultCol) {
+  udfTrace("block:%p, processing begins, rows:%d cols:%d", block, block->numOfRows, block->numOfCols);
+
   if (block->numOfCols < 2) {
+    udfError("block:%p, cols:%d needs to be greater than 2", block, block->numOfCols);
     return TSDB_CODE_UDF_INVALID_INPUT;
   }
 
   for (int32_t i = 0; i < block->numOfCols; ++i) {
     SUdfColumn* col = block->udfCols[i];
-    if (!(col->colMeta.type == TSDB_DATA_TYPE_INT)) {
+    if (col->colMeta.type != TSDB_DATA_TYPE_INT) {
+      udfError("block:%p, col:%d type:%d should be int(%d)", block, i, col->colMeta.type, TSDB_DATA_TYPE_INT);
       return TSDB_CODE_UDF_INVALID_INPUT;
     }
   }
@@ -23,25 +27,35 @@ DLL_EXPORT int32_t bit_and(SUdfDataBlock* block, SUdfColumn* resultCol) {
 
   for (int32_t i = 0; i < block->numOfRows; ++i) {
     if (udfColDataIsNull(block->udfCols[0], i)) {
+      udfTrace("block:%p, row:%d result is null since col:0 is null", block, i);
       udfColDataSetNull(resultCol, i);
       continue;
     }
+
     int32_t result = *(int32_t*)udfColDataGetData(block->udfCols[0], i);
-    int     j = 1;
+    udfTrace("block:%p, row:%d col:0 data:%d", block, i, result);
+
+    int32_t j = 1;
     for (; j < block->numOfCols; ++j) {
       if (udfColDataIsNull(block->udfCols[j], i)) {
+        udfTrace("block:%p, row:%d result is null since col:%d is null", block, i, j);
         udfColDataSetNull(resultCol, i);
         break;
       }
 
       char* colData = udfColDataGetData(block->udfCols[j], i);
       result &= *(int32_t*)colData;
+      udfTrace("block:%p, row:%d col:%d data:%d", block, i, j, *(int32_t*)colData);
     }
+
     if (j == block->numOfCols) {
       udfColDataSet(resultCol, i, (char*)&result, false);
+      udfTrace("block:%p, row:%d result is %d", block, i, result);
     }
   }
+
   resultData->numOfRows = block->numOfRows;
+  udfTrace("block:%p, processing completed, rows:%d, cols:%d,", block, block->numOfRows, block->numOfCols);
 
   return TSDB_CODE_SUCCESS;
 }