fix: last error

source/libs/executor/src/scanoperator.c

@@ -529,8 +529,8 @@ static void prepareForDescendingScan(STableScanBase* pTableScanInfo, SqlFunction
 
   switchCtxOrder(pCtx, numOfOutput);
   pTableScanInfo->cond.order = TSDB_ORDER_DESC;
-  STimeWindow* pTWindow = &pTableScanInfo->cond.twindows;
-  TSWAP(pTWindow->skey, pTWindow->ekey);
+  // STimeWindow* pTWindow = &pTableScanInfo->cond.twindows;
+  // TSWAP(pTWindow->skey, pTWindow->ekey);
 }
 
 typedef struct STableCachedVal {

test/cases/22-Functions/02-Aggregate/test_agg_last.py

@@ -0,0 +1,71 @@
+import time
+import math
+import random
+from new_test_framework.utils import tdLog, tdSql, tdStream, streamUtil,StreamTableType, StreamTable, cluster,tdCom
+from random import randint
+import os
+import subprocess
+import json
+import random
+import time
+import datetime
+
+class Test_Last:
+    caseName = "test_last"
+    currentDir = os.path.dirname(os.path.abspath(__file__))
+    dbname = "test"
+    stbname= "meters"
+
+    def setup_class(cls):
+        tdLog.debug(f"start to execute {__file__}")
+
+    def test_last(self):
+        """Agg-basic: last
+
+        Test the LAST function
+
+        Catalog:
+            - Function:Aggregate
+
+        Since: v3.0.0.0
+
+        Labels: common,ci
+
+        Jira: None
+
+        History:
+            - 2025-9-18 Stephen Jin
+
+        """
+
+        self.prepareHistoryData()
+        self.insertNowData()
+        self.checkResult()
+
+    def prepareHistoryData(self):
+        cmd = f"taosBenchmark -t 100 -n 10000 -y"
+        ret = os.system(cmd)
+        if ret != 0:
+            raise Exception("taosBenchmark run failed")
+        time.sleep(5)
+        tdLog.info(f"Prepare history data:taosBenchmark -t 100 -n 10000 -y")
+
+    def insertNowData(self):
+        tdSql.execute(f"use {self.dbname}")
+
+        tdSql.execute(f"insert into {self.dbname}.d1 values (1759194759000, 1.1, 1.1, 245)")
+        tdSql.execute(f"insert into {self.dbname}.d15 values (1759194759001, 1.1, 1.1, 245)")
+
+    def checkResult(self):
+        tdSql.query(f"select last(ts) from {self.dbname}.{self.stbname}")
+        tdSql.checkRows(1)
+        tdSql.checkData(0, 0, 1759194759001)
+
+        tdSql.query(f"select last(ts), first(ts) from {self.dbname}.{self.stbname}")
+        tdSql.checkRows(1)
+        tdSql.checkData(0, 0, 1759194759001)
+
+        tdSql.query(f"select first(ts), last(ts) from {self.dbname}.{self.stbname}")
+        tdSql.checkRows(1)
+        tdSql.checkData(0, 1, 1759194759001)
+

test/cases/41-StreamProcessing/03-TriggerMode/ans/test_stream_sliding_trigger.0-0-0-1-1.csv

@@ -1,5 +1,5 @@
 
-taos> select * from test1.`s0-0-0-1-1_out` order by tag_tbname
+taos> select * from test1.`s0-0-0-1-1_out` order by tag_tbname, cts
            cts           |    cint     |           tag_tbname           |
 =========================================================================
  2025-01-01 00:19:00.000 |          38 | st1_0                          |

test/cases/41-StreamProcessing/03-TriggerMode/test_sliding.py

@@ -117,7 +117,7 @@ class TestStreamSlidingTrigger:
         "0-0-0-0-27": [40, None, True, [], ""], #success
 
         "0-0-0-1-0": [3, None, True, [], ""], #success
-        "0-0-0-1-1": [6, None, True, [], "order by tag_tbname"], #success
+        "0-0-0-1-1": [6, None, True, [], "order by tag_tbname, cts"], #success
         "0-0-0-1-2": [120, None, True, [], ""], #success
         "0-0-0-1-4": [120, None, True, [], "order by cts, tag_tbname"],  #success
         "0-0-0-1-6": [3513, None, True, [], ""], #success

test/ci/cases.task

@@ -260,6 +260,7 @@
 ,,y,.,./ci/pytest.sh pytest cases/22-Functions/02-Aggregate/test_agg_sum.py
 ,,y,.,./ci/pytest.sh pytest cases/22-Functions/02-Aggregate/test_agg_gconcat.py
 ,,y,.,./ci/pytest.sh pytest cases/22-Functions/02-Aggregate/test_agg_smoking.py
+,,y,.,./ci/pytest.sh pytest cases/22-Functions/02-Aggregate/test_agg_last.py
 ## 03-Selection
 ,,y,.,./ci/pytest.sh pytest cases/22-Functions/03-Selection/test_select_all.py
 ,,y,.,./ci/pytest.sh pytest cases/22-Functions/03-Selection/test_select_first_last.py