黑斑羚的AVG随时间变化窗口.除以…ORDER BY)

Question

我在Impala中有一个表，其中我的时间信息为UnixTime，频率为1mSec。我试图获得AVG()， MIN()和MAX()的10秒的窗口(但我不想修复它，可以是20秒，30秒等)。

我正在使用子查询，但我没有得到正确的答案。以下是我的表格中的数据:表中数据

我使用下面的子查询来获得AVG()， MIN()和MAX() 10秒的窗口。我使用OVER (PARTITION BY…)ORDER BY)，但没有得到正确的结果。我的查询如下:

SELECT DISTINCT *
FROM
(SELECT ts,
last_value(Table1.val1) OVER (PARTITION BY Table1.ts ORDER BY Table1.ts rows between unbounded preceding and unbounded following) as val1,
AVG(Table1.val2) OVER (PARTITION BY Table1.ts ORDER BY Table1.ts rows between unbounded preceding and unbounded following) as val2
MIN(Table1.val3) OVER (PARTITION BY Table1.ts ORDER BY Table1.ts rows between unbounded preceding and unbounded following) as val2
MAX(Table1.val4) OVER (PARTITION BY Table1.ts ORDER BY Table1.ts rows between unbounded preceding and unbounded following) as val2
FROM (SELECT cast(cast(unix_timestamp(cast(ts/1000 as TIMESTAMP))/10 as bigint)*10 as TIMESTAMP) as ts , 
val1 as val1, 
val2 as val2, 
val3 as val3, 
val4 as val4 
FROM Sensor_Data.Table where unit='Unit1'  
and cast(ts/1000 as TIMESTAMP) BETWEEN '2020-11-29 22:30:00' and '2020-12-01 01:51:00') as Table1) as Table2
ORDER BY ts

我需要以下答案:

Time                    Val1        Val2        Val3        Val4
2020-11-29 22:30:00     last_value  AVG         MIN         MAX
2020-11-29 22:30:10     last_value  AVG         MIN         MAX
2020-11-29 22:30:20     last_value  AVG         MIN         MAX

谁能告诉我我的Impala查询出了什么问题?

谢谢! !

Answer 1

我想你只是想要聚合，而不是窗口函数:

SELECT cast(cast(unix_timestamp(cast(ts/1000 as TIMESTAMP))/10 as bigint)*10 as TIMESTAMP),
AVG(val2) as val2,
MIN(val3) as val3,
MAX(val4) as val4
FROM Sensor_Data.Table
WHERE unit = 'Unit1' AND
CAST(ts/1000 as TIMESTAMP) BETWEEN '2020-11-29 22:30:00' and '2020-12-01 01:51:00'
GROUP BY cast(cast(unix_timestamp(cast(ts/1000 as TIMESTAMP))/10 as bigint)*10 as TIMESTAMP)