[TD-11220]<feature>(query): time related functions

src/client/src/tscSQLParser.c

@@ -10302,6 +10302,10 @@ 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));

src/common/inc/texpr.h

@@ -134,6 +134,7 @@ typedef struct tExprNode {
       int16_t functionId;
       int32_t numChildren;
       struct tExprNode **pChildren;
+      int32_t precision;
     } _func;
 
     TAOS_FIELD        *pType;

src/common/src/texpr.c

@@ -1189,7 +1189,7 @@ int32_t exprValidateTimeNode(tExprNode *pExpr) {
         return TSDB_CODE_TSC_OUT_OF_MEMORY;
       }
       child->pVal->nType = TSDB_DATA_TYPE_TIMESTAMP;
-      child->pVal->i64   = taosGetTimestampToday() * 1000;
+      child->pVal->i64   = taosGetTimestampToday() * pExpr->_func.precision;
       pExpr->resultType  = TSDB_DATA_TYPE_TIMESTAMP;
       pExpr->resultBytes = (int16_t)tDataTypes[pExpr->resultType].bytes;
       break;