diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index e80f78c9638c7e99ba3f2707651b6fbb8299a04f..5055f95867f05a599a302462f98fc6e539beed5b 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -10126,6 +10126,10 @@ int32_t exprTreeFromSqlExpr(SSqlCmd* pCmd, tExprNode **pExpr, const tSqlExpr* pS
       (*pExpr)->pVal = calloc(1, sizeof(tVariant));
       tVariantAssign((*pExpr)->pVal, &pSqlExpr->value);
 
+      STableMetaInfo* pTableMetaInfo = tscGetMetaInfo(pQueryInfo, pQueryInfo->curTableIdx);
+      STableComInfo tinfo = tscGetTableInfo(pTableMetaInfo->pTableMeta);
+      (*pExpr)->precision = tinfo.precision;
+
       STableMeta* pTableMeta = tscGetMetaInfo(pQueryInfo, pQueryInfo->curTableIdx)->pTableMeta;
       if (pCols != NULL) {
         size_t colSize = taosArrayGetSize(pCols);
@@ -10288,6 +10292,11 @@ int32_t exprTreeFromSqlExpr(SSqlCmd* pCmd, tExprNode **pExpr, const tSqlExpr* pS
       *pExpr = calloc(1, sizeof(tExprNode));
       (*pExpr)->nodeType = TSQL_NODE_FUNC;
       (*pExpr)->_func.functionId = pSqlExpr->functionId;
+
+      STableMetaInfo* pTableMetaInfo = tscGetMetaInfo(pQueryInfo, pQueryInfo->curTableIdx);
+      STableComInfo tinfo = tscGetTableInfo(pTableMetaInfo->pTableMeta);
+      (*pExpr)->precision = tinfo.precision;
+
       SArray* paramList = pSqlExpr->Expr.paramList;
       size_t paramSize = paramList ? taosArrayGetSize(paramList) : 0;
       if (paramSize > 0) {
@@ -10302,10 +10311,6 @@ int32_t exprTreeFromSqlExpr(SSqlCmd* pCmd, tExprNode **pExpr, const tSqlExpr* pS
           return ret;
         }
       }
-      //set precision
-      STableMetaInfo* pTableMetaInfo = tscGetMetaInfo(pQueryInfo, pQueryInfo->curTableIdx);
-      STableComInfo tinfo = tscGetTableInfo(pTableMetaInfo->pTableMeta);
-      (*pExpr)->_func.precision = tinfo.precision;
     } else {
       // arithmetic expression on the results of aggregation functions
       *pExpr = calloc(1, sizeof(tExprNode));
diff --git a/src/common/inc/texpr.h b/src/common/inc/texpr.h
index ca692a213580cce3277801d007ebde4c15fe72d9..30e46baeb0b59fe56d7b4b339eff97740fa6cea7 100644
--- a/src/common/inc/texpr.h
+++ b/src/common/inc/texpr.h
@@ -135,13 +135,13 @@ typedef struct tExprNode {
       int16_t functionId;
       int32_t numChildren;
       struct tExprNode **pChildren;
-      int32_t precision;
     } _func;
 
     TAOS_FIELD        *pType;
   };
   int16_t resultType;
   int16_t resultBytes;
+  int32_t precision;
 } tExprNode;
 
 typedef struct SExprTraverseSupp {
diff --git a/src/common/src/tarithoperator.c b/src/common/src/tarithoperator.c
index 65f170ff68f40e2d408f2931657dcc8b05a25547..79f521dbc00f497ef5ae22175cf5b5803fcb283b 100644
--- a/src/common/src/tarithoperator.c
+++ b/src/common/src/tarithoperator.c
@@ -114,6 +114,8 @@ _arithmetic_getVectorDoubleValue_fn_t getVectorDoubleValueFn(int32_t srcType) {
         p = getVectorDoubleValue_FLOAT;
     }else if(srcType==TSDB_DATA_TYPE_DOUBLE) {
         p = getVectorDoubleValue_DOUBLE;
+    }else if(srcType==TSDB_DATA_TYPE_TIMESTAMP) {
+        p = getVectorDoubleValue_BIGINT;
     }else {
         assert(0);
     }
diff --git a/src/common/src/texpr.c b/src/common/src/texpr.c
index 3d47fbeb94aa235be29bdd21154d742a81449f15..b4bc1ab30fa1efb974207f17c8a9f34d0d7999fb 100644
--- a/src/common/src/texpr.c
+++ b/src/common/src/texpr.c
@@ -495,9 +495,13 @@ void exprTreeExprNodeTraverse(tExprNode *pExpr, int32_t numOfRows, tExprOperandI
 
   _arithmetic_operator_fn_t OperatorFn = getArithmeticOperatorFn(pExpr->_node.optr);
   OperatorFn(leftIn, leftNum, leftType, rightIn, rightNum, rightType, output->data, fnOrder);
-  
+
   output->numOfRows = MAX(leftNum, rightNum);
-  output->type = TSDB_DATA_TYPE_DOUBLE;
+  if(leftType == TSDB_DATA_TYPE_TIMESTAMP || rightType == TSDB_DATA_TYPE_TIMESTAMP) {
+    output->type = TSDB_DATA_TYPE_BIGINT;
+  } else {
+    output->type = TSDB_DATA_TYPE_DOUBLE;
+  }
   output->bytes = tDataTypes[output->type].bytes;
 
   tfree(ltmp);
@@ -1197,7 +1201,7 @@ int32_t exprValidateTimeNode(tExprNode *pExpr) {
       } else {
         timeValMs = taosGetTimestampToday() * 1000;
       }
-      child->pVal->i64 = convertTimePrecision(timeValMs, TSDB_TIME_PRECISION_MILLI, pExpr->_func.precision);
+      child->pVal->i64 = convertTimePrecision(timeValMs, TSDB_TIME_PRECISION_MILLI, pExpr->precision);
       pExpr->resultType  = TSDB_DATA_TYPE_TIMESTAMP;
       pExpr->resultBytes = (int16_t)tDataTypes[pExpr->resultType].bytes;
       break;