Error with Hive SubQuery - Unsupported SubQuery Expression - sql

Question

create table db.temp
location '/user/temp' as
SELECT t1.mobile_no
FROM db.temp t1
WHERE NOT EXISTS ( SELECT NULL
FROM db.temp t2
WHERE t1.mobile_no = t2.mobile_no
AND t1.cell != t2.cell
AND t2.access_time BETWEEN t1.access_time
AND t1.access_time_5);
I need to get all the users who used the same cell for 5 hours of the time interval(access_time_5) from access time. This code perfectly fine with impala. But not works in Hive.
Gives an error
"Error while compiling statement: FAILED:
SemanticException [Error 10249]: line 23:25 Unsupported SubQuery
Expression"
I looked at a similar question related to this error. Can't figure out the solution. Any help would be highly appreciated!

Answer 1

Correlated BETWEEN is not supported in Hive as well as non-equi joins. Try to rewrite using LEFT JOIN, count rows with your condition and filter:
select mobile_no from
(
SELECT t1.mobile_no,
sum(case when t1.cell != t2.cell
and t2.access_time between t1.access_time and t1.access_time_5
then 1 else 0
end) as cnt_exclude
FROM db.temp t1
LEFT JOIN db.temp t2 on t1.mobile_no = t2.mobile_no
GROUP BY t1.mobile_no
)s
where cnt_exclude=0
The problem with such solution is that LEFT JOIN may produce huge duplication and it will affect performance, though it may work if the data is not too big.

Answer 2

It seems to me that window functions would be better for both databases. Let me assume that access_time is a Unix time (i.e. measured in seconds). You can easily convert the value to such a time:
SELECT t1.mobile_no
FROM (SELECT t1.*,
MIN(t1.cell) OVER (PARTITION BY mobile_no
ORDER BY access_time
RANGE BETWEEN 17999 preceding AND CURRENT ROW
) as min_cell,
MAX(t1.cell) OVER (PARTITION BY mobile_no
ORDER BY access_time
RANGE BETWEEN 17999 preceding AND CURRENT ROW
) as max_cell
FROM db.temp t1
) t1
WHERE min_cell = max_cell;