test:add stddev test cases

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

@@ -0,0 +1,54 @@
+import numpy as np
+from util.log import *
+from util.cases import *
+from util.sql import *
+from util.common import *
+from util.sqlset import *
+
+'''
+Test case for TS-5150
+'''
+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.ts = 1537146000000
+    def initdabase(self):
+        tdSql.execute('create database if not exists db_test vgroups 2  buffer 10')
+        tdSql.execute('use db_test')
+        tdSql.execute('create stable stb(ts timestamp, delay int) tags(groupid int)')
+        tdSql.execute('create table t1 using stb tags(1)')
+        tdSql.execute('create table t2 using stb tags(2)')
+        tdSql.execute('create table t3 using stb tags(3)')
+        tdSql.execute('create table t4 using stb tags(4)')
+        tdSql.execute('create table t5 using stb tags(5)')
+        tdSql.execute('create table t6 using stb tags(6)')
+    def insert_data(self):
+        for i in range(5000):
+            tdSql.execute(f"insert into t1 values({self.ts + i * 1000}, {i%5})")
+            tdSql.execute(f"insert into t2 values({self.ts + i * 1000}, {i%5})")
+            tdSql.execute(f"insert into t3 values({self.ts + i * 1000}, {i%5})")
+
+    def verify_stddev(self):
+        for i in range(20):
+            tdSql.query(f'SELECT MAX(CASE WHEN delay != 0 THEN delay ELSE NULL END) AS maxDelay,\
+                        MIN(CASE WHEN delay != 0 THEN delay ELSE NULL END) AS minDelay,\
+                        AVG(CASE WHEN delay != 0 THEN delay ELSE NULL END) AS avgDelay,\
+                        STDDEV(CASE WHEN delay != 0 THEN delay ELSE NULL END) AS jitter,\
+                        COUNT(CASE WHEN delay = 0 THEN 1 ELSE NULL END) AS timeoutCount,\
+                        COUNT(*) AS totalCount from stb where ts between {1537146000000 + i * 1000} and {1537146000000 + (i+10) * 1000}')
+            res = tdSql.queryResult[0][3]
+            assert res > 0.8
+    def run(self):
+        self.initdabase()
+        self.insert_data()
+        self.verify_stddev()
+    def stop(self):
+        tdSql.close()
+        tdLog.success(f"{__file__} successfully executed")
+
+
+tdCases.addLinux(__file__, TDTestCase())
+tdCases.addWindows(__file__, TDTestCase())
+