only one ts column when sample on interval or session window

tests/develop-test/2-query/TD-14745.py

+import sys
+from util.log import *
+from util.cases import *
+from util.sql import *
+from util.dnodes import tdDnodes
+from math import inf
+
+class TDTestCase:
+    def caseDescription(self):
+        '''
+        case1<shenglian zhou>: [TD-13946]core dump of sampling binary column so that when result from  vnode exceeds INT16_MAX bytes
+        '''
+        return
+
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor(), logSql)
+        self._conn = conn
+
+    def run(self):
+        print("running {}".format(__file__))
+        tdSql.execute("drop database if exists td14745")
+        tdSql.execute("create database td14745")
+        tdSql.execute("use td14745")
+
+        tdSql.execute("create table st ( ts timestamp, i int) tags (t1 int)")
+        tdSql.execute("create table ct1 using st tags(1)")
+
+        for i in range(100):
+            tdSql.execute("insert into ct1 values(now+{}a, {})".format(100*i, i))
+
+        tdSql.query("select sample(i,3) from ct1 interval(1s)")
+        tdSql.checkCols(2)
+        
+        tdSql.query("select sample(i,3) from ct1 session(ts, 200a)")
+        tdSql.checkCols(2)
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())
+