enh: add param for to_unixtimestamp to return timestamp type

source/libs/function/src/builtins.c

@@ -1933,14 +1933,35 @@ static int32_t translateToIso8601(SFunctionNode* pFunc, char* pErrBuf, int32_t l
 }
 
 static int32_t translateToUnixtimestamp(SFunctionNode* pFunc, char* pErrBuf, int32_t len) {
-  if (1 != LIST_LENGTH(pFunc->pParameterList)) {
+  int32_t numOfParams = LIST_LENGTH(pFunc->pParameterList);
+  int16_t resType = TSDB_DATA_TYPE_BIGINT;
+
+  if (1 != numOfParams && 2 != numOfParams) {
     return invaildFuncParaNumErrMsg(pErrBuf, len, pFunc->functionName);
   }
 
-  if (!IS_STR_DATA_TYPE(((SExprNode*)nodesListGetNode(pFunc->pParameterList, 0))->resType.type)) {
+  uint8_t para1Type = ((SExprNode*)nodesListGetNode(pFunc->pParameterList, 0))->resType.type;
+  if (!IS_STR_DATA_TYPE(para1Type)) {
     return invaildFuncParaTypeErrMsg(pErrBuf, len, pFunc->functionName);
   }
 
+  if (2 == numOfParams) {
+    uint8_t para2Type = ((SExprNode*)nodesListGetNode(pFunc->pParameterList, 1))->resType.type;
+    if (!IS_INTEGER_TYPE(para2Type)) {
+      return invaildFuncParaTypeErrMsg(pErrBuf, len, pFunc->functionName);
+    }
+
+    SValueNode* pValue = (SValueNode*)nodesListGetNode(pFunc->pParameterList, 1);
+    if (pValue->datum.i == 1) {
+      resType = TSDB_DATA_TYPE_TIMESTAMP;
+    } else if (pValue->datum.i == 0) {
+      resType = TSDB_DATA_TYPE_BIGINT;
+    } else {
+      return buildFuncErrMsg(pErrBuf, len, TSDB_CODE_FUNC_FUNTION_ERROR,
+                             "TO_UNIXTIMESTAMP function second parameter should be 0/1");
+    }
+  }
+
   // add database precision as param
   uint8_t dbPrec = pFunc->node.resType.precision;
   int32_t code = addDbPrecisonParam(&pFunc->pParameterList, dbPrec);
@@ -1948,7 +1969,7 @@ static int32_t translateToUnixtimestamp(SFunctionNode* pFunc, char* pErrBuf, int
     return code;
   }
 
-  pFunc->node.resType = (SDataType){.bytes = tDataTypes[TSDB_DATA_TYPE_BIGINT].bytes, .type = TSDB_DATA_TYPE_BIGINT};
+  pFunc->node.resType = (SDataType){.bytes = tDataTypes[resType].bytes, .type = resType};
   return TSDB_CODE_SUCCESS;
 }
 

source/libs/scalar/src/sclfunc.c

@@ -1124,7 +1124,8 @@ _end:
 int32_t toUnixtimestampFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput) {
   int32_t type = GET_PARAM_TYPE(pInput);
   int64_t timePrec;
-  GET_TYPED_DATA(timePrec, int64_t, GET_PARAM_TYPE(&pInput[1]), pInput[1].columnData->pData);
+  int32_t idx = (inputNum == 2) ? 1 : 2;
+  GET_TYPED_DATA(timePrec, int64_t, GET_PARAM_TYPE(&pInput[idx]), pInput[idx].columnData->pData);
 
   for (int32_t i = 0; i < pInput[0].numOfRows; ++i) {
     if (colDataIsNull_s(pInput[0].columnData, i)) {