Github user takuti commented on the issue:
https://github.com/apache/incubator-hivemall/pull/107
Importantly, in case that the number of mappers is 1, fixing the bug in
`merge()` does not change the output value; you might see the same result
`0.42483920860540153` even if the bug exists.
Alternatively, let you test the following query (6 mappers will be shown
for each `select` statement), and check if its output is same as
`fmeasure(truth, predicted, '-average micro')`:
```sql
WITH data as (
select 1 as truth, 0 as predicted
union all
select 0 as truth, 1 as predicted
union all
select 0 as truth, 0 as predicted
union all
select 1 as truth, 1 as predicted
union all
select 0 as truth, 1 as predicted
union all
select 0 as truth, 0 as predicted
)
select
f1score(array(truth), array(predicted))
from data
;
```
If the bug has been fixed correctly, output should be same as
`fmeasure(truth, predicted, '-average micro) = 0.5`, while the buggy code
returns `f1score(array(truth), array(predicted)) = 1.0`
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