Github user nzw0301 commented on the issue:
https://github.com/apache/incubator-hivemall/pull/107
The issue above is avoided by creating table:
```
create table data as (
select 1 as truth, 1 as predicted
);
```
```
// ok
select
fmeasure(array(truth), array(predicted))
from data
;
// ok
select
f1score(array(truth), array(predicted))
from data
;
```
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