test: add test case for precison

tests/system-test/2-query/db.py

+import taos
+import sys
+import datetime
+import inspect
+
+from util.log import *
+from util.sql import *
+from util.cases import *
+import random
+
+
+class TDTestCase:
+    updatecfgDict = {'debugFlag': 143, "cDebugFlag": 143, "uDebugFlag": 143, "rpcDebugFlag": 143, "tmrDebugFlag": 143,
+                     "jniDebugFlag": 143, "simDebugFlag": 143, "dDebugFlag": 143, "dDebugFlag": 143, "vDebugFlag": 143, "mDebugFlag": 143, "qDebugFlag": 143,
+                     "wDebugFlag": 143, "sDebugFlag": 143, "tsdbDebugFlag": 143, "tqDebugFlag": 143, "fsDebugFlag": 143, "udfDebugFlag": 143}
+
+    def init(self, conn, logSql):
+        tdLog.debug(f"start to excute {__file__}")
+        tdSql.init(conn.cursor(), False)
+
+    def case1(self):
+        tdSql.execute("create database if not exists dbms precision 'ms'")
+        tdSql.execute("create database if not exists dbus precision 'us'")
+        tdSql.execute("create database if not exists dbns precision 'ns'")
+
+        tdSql.execute("create table dbms.ntb (ts timestamp, c1 int, c2 bigint)")
+        tdSql.execute("create table dbus.ntb (ts timestamp, c1 int, c2 bigint)")
+        tdSql.execute("create table dbns.ntb (ts timestamp, c1 int, c2 bigint)")
+        
+        tdSql.execute("insert into dbms.ntb values ('2022-01-01 08:00:00.001', 1, 2)")
+        tdSql.execute("insert into dbms.ntb values ('2022-01-01 08:00:00.002', 3, 4)")
+        
+        tdSql.execute("insert into dbus.ntb values ('2022-01-01 08:00:00.000001', 1, 2)")
+        tdSql.execute("insert into dbus.ntb values ('2022-01-01 08:00:00.000002', 3, 4)")
+        
+        tdSql.execute("insert into dbns.ntb values ('2022-01-01 08:00:00.000000001', 1, 2)")
+        tdSql.execute("insert into dbns.ntb values ('2022-01-01 08:00:00.000000002', 3, 4)")
+        
+        tdSql.query("select count(c1) from dbms.ntb interval(1a)")
+        tdSql.checkRows(2)
+        
+        tdSql.query("select count(c1) from dbus.ntb interval(1u)")
+        tdSql.checkRows(2)
+        
+        tdSql.query("select count(c1) from dbns.ntb interval(1b)")
+        tdSql.checkRows(2)
+
+    def run(self):  # sourcery skip: extract-duplicate-method, remove-redundant-fstring
+        tdSql.prepare()
+
+        tdLog.printNoPrefix("==========start case1 run ...............")
+
+        self.case1()
+
+        tdLog.printNoPrefix("==========end case1 run ...............")
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success(f"{__file__} successfully executed")
+
+
+tdCases.addLinux(__file__, TDTestCase())
+tdCases.addWindows(__file__, TDTestCase())

tests/system-test/fulltest.sh

@@ -29,6 +29,7 @@ python3 ./test.py -f 1-insert/block_wise.py
 python3 ./test.py -f 1-insert/create_retentions.py
 python3 ./test.py -f 1-insert/table_param_ttl.py
 
+python3 ./test.py -f 2-query/db.py
 python3 ./test.py -f 2-query/between.py
 python3 ./test.py -f 2-query/distinct.py
 python3 ./test.py -f 2-query/varchar.py