diff --git a/source/libs/scalar/src/sclfunc.c b/source/libs/scalar/src/sclfunc.c
index 8f90e78c8c628c3d8d96b574b5c7f29c2439be80..e6b7c755644f8a59dfc27a7ff12829de9bed74bd 100644
--- a/source/libs/scalar/src/sclfunc.c
+++ b/source/libs/scalar/src/sclfunc.c
@@ -360,9 +360,6 @@ static void trtrim(char *input, char *output, int32_t type, int32_t charLen) {
 
 static int32_t doLengthFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput, _len_fn lenFn) {
   int32_t type = GET_PARAM_TYPE(pInput);
-  if (inputNum != 1 || !IS_VAR_DATA_TYPE(type)) {
-    return TSDB_CODE_FAILED;
-  }
 
   SColumnInfoData *pInputData  = pInput->columnData;
   SColumnInfoData *pOutputData = pOutput->columnData;
@@ -586,9 +583,6 @@ DONE:
 
 static int32_t doCaseConvFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput, _conv_fn convFn) {
   int32_t type = GET_PARAM_TYPE(pInput);
-  if (inputNum != 1 || !IS_VAR_DATA_TYPE(type)) {
-    return TSDB_CODE_FAILED;
-  }
 
   SColumnInfoData *pInputData  = pInput->columnData;
   SColumnInfoData *pOutputData = pOutput->columnData;
@@ -628,9 +622,6 @@ static int32_t doCaseConvFunction(SScalarParam *pInput, int32_t inputNum, SScala
 
 static int32_t doTrimFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput, _trim_fn trimFn) {
   int32_t type = GET_PARAM_TYPE(pInput);
-  if (inputNum != 1 || !IS_VAR_DATA_TYPE(type)) {
-    return TSDB_CODE_FAILED;
-  }
 
   SColumnInfoData *pInputData  = pInput->columnData;
   SColumnInfoData *pOutputData = pOutput->columnData;
@@ -664,16 +655,10 @@ static int32_t doTrimFunction(SScalarParam *pInput, int32_t inputNum, SScalarPar
 int32_t substrFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput) {
   int32_t subPos = 0;
   GET_TYPED_DATA(subPos, int32_t, GET_PARAM_TYPE(&pInput[1]), pInput[1].columnData->pData);
-  if (subPos == 0) { //subPos needs to be positive or negative values;
-    return TSDB_CODE_FAILED;
-  }
 
   int32_t subLen = INT16_MAX;
   if (inputNum == 3) {
     GET_TYPED_DATA(subLen, int32_t, GET_PARAM_TYPE(&pInput[2]), pInput[2].columnData->pData);
-    if (subLen < 0 || subLen > INT16_MAX) { //subLen cannot be negative
-      return TSDB_CODE_FAILED;
-    }
     subLen = (GET_PARAM_TYPE(pInput) == TSDB_DATA_TYPE_VARCHAR) ? subLen : subLen * TSDB_NCHAR_SIZE;
   }
 
@@ -1149,13 +1134,6 @@ int32_t toUnixtimestampFunction(SScalarParam *pInput, int32_t inputNum, SScalarP
 
 int32_t toJsonFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput) {
   int32_t type = GET_PARAM_TYPE(pInput);
-  if (type != TSDB_DATA_TYPE_BINARY && type != TSDB_DATA_TYPE_NCHAR) {
-    return TSDB_CODE_FAILED;
-  }
-
-  if (inputNum != 1) {
-    return TSDB_CODE_FAILED;
-  }
 
   char tmp[TSDB_MAX_JSON_TAG_LEN] = {0};
   for (int32_t i = 0; i < pInput[0].numOfRows; ++i) {