fix: add keep time offset case

tests/parallel_test/cases.task

@@ -815,6 +815,7 @@
 ,,y,system-test,./pytest.sh python3 ./test.py -f 99-TDcase/TD-20582.py
 ,,n,system-test,python3 ./test.py -f 5-taos-tools/taosbenchmark/insertMix.py -N 3
 ,,n,system-test,python3 ./test.py -f 5-taos-tools/taosbenchmark/stt.py -N 3
+,,n,system-test,python3 ./test.py -f eco-system/meta/database/keep_time_offset.py
 
 #tsim test
 ,,y,script,./test.sh -f tsim/tmq/basic2Of2ConsOverlap.sim

tests/system-test/eco-system/meta/database/keep_time_offset.py

@@ -0,0 +1,69 @@
+###################################################################
+#           Copyright (c) 2016 by TAOS Technologies, Inc.
+#                     All rights reserved.
+#
+#  This file is proprietary and confidential to TAOS Technologies.
+#  No part of this file may be reproduced, stored, transmitted,
+#  disclosed or used in any form or by any means other than as
+#  expressly provided by the written permission from Jianhui Tao
+#
+###################################################################
+
+# -*- coding: utf-8 -*-
+
+import re
+from util.log import *
+from util.cases import *
+from util.sql import *
+from util.common import *
+from util.sqlset import *
+
+class TDTestCase:
+    def init(self, conn, logSql, replicaVar=1):
+        self.replicaVar = int(replicaVar)
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor())
+        self.setsql = TDSetSql()
+
+    def create_db(self):
+        hours = 8
+        # create
+        keep_str = f"KEEP_TIME_OFFSET {hours}"
+        tdSql.execute(f"create database db {keep_str}")
+
+        # check result
+        tdSql.query(" show create database db")
+        create_sql = tdSql.getData(0, 1)
+        if create_sql.find(keep_str) == -1:
+            tdLog.exit(f"create database sql not found {keep_str} sql:{create_sql}")
+
+        # alter
+        hours = 4
+        keep_str = f"KEEP_TIME_OFFSET {hours}"
+        tdSql.execute(f"alter database db {keep_str}")
+
+        # check result
+        tdSql.query(" show create database db")
+        create_sql = tdSql.getData(0, 1)        
+        if create_sql.find(keep_str) == -1:
+            tdLog.exit(f"create database sql not found {keep_str} sql:{create_sql}")
+
+    def check_old_syntax(self):
+        # old syntax would not support again
+        tdSql.error("alter dnode 1 'keeptimeoffset 10';")
+
+
+    def run(self):
+        # check new syntax right
+        self.create_db()
+
+        # check old syntax error
+        self.check_old_syntax()
+        
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())

utils/TSZ/sz/src/Huffman.c

@@ -125,7 +125,10 @@ void build_code(HuffmanTree *huffmanTree, node n, int len, unsigned long out1, u
 		huffmanTree->code[n->c] = (unsigned long*)malloc(2*sizeof(unsigned long));
 		if(len<=64)
 		{
-			(huffmanTree->code[n->c])[0] = out1 << (64 - len);
+			if(len == 0)
+			  (huffmanTree->code[n->c])[0] = 0;
+			else 
+			  (huffmanTree->code[n->c])[0] = out1 << (64 - len);
 			(huffmanTree->code[n->c])[1] = out2;
 		}
 		else