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

src/client/src/tscSQLParser.c

@@ -5163,6 +5163,7 @@ static int32_t handleExprInQueryCond(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, tSql
   }else{
     colName = &(pLeft->columnName);
   }
+
   int32_t ret = TSDB_CODE_SUCCESS;
 
   SColumnIndex index = COLUMN_INDEX_INITIALIZER;
@@ -5437,6 +5438,21 @@ int32_t getQueryCondExpr(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, tSqlExpr** pExpr
     goto err_ret;
   }
 
+  //for now(),today() function used in where clause.
+  if (pRight->tokenId == TK_ID && (strncmp(pRight->exprToken.z, "now()", pRight->exprToken.n) == 0 ||
+                                   strncmp(pRight->exprToken.z, "today()", pRight->exprToken.n) == 0)) {
+    pRight->type = SQL_NODE_VALUE;
+    pRight->tokenId = TK_TIMESTAMP;
+    pRight->exprToken.type = TSDB_DATA_TYPE_TIMESTAMP;
+    if (strncmp(pRight->exprToken.z, "now()", pRight->exprToken.n) == 0) {
+      tVariantCreateExt(&pRight->value, &pRight->exprToken, TK_NOW, false);
+    } else {
+      tVariantCreateExt(&pRight->value, &pRight->exprToken, TK_TODAY, false);
+    }
+    pRight->value.nType = TSDB_DATA_TYPE_BIGINT;
+    pRight->flags |= 1 << EXPR_FLAG_NS_TIMESTAMP;
+  }
+
   ret = handleExprInQueryCond(pCmd, pQueryInfo, pExpr, pCondExpr, type, tbIdx, parentOptr, columnExpr, tsExpr, joinQuery);
   if (ret) {
     goto err_ret;