Github user takuti commented on the issue:
https://github.com/apache/incubator-hivemall/pull/58
### feature_pairs()
```sql
drop temporary function if exists feature_pairs;
create temporary function feature_pairs as
'hivemall.ftvec.pairing.FeaturePairsUDTF';
select
t1.rowid,
t2.i,
t2.j,
t2.Xi,
t2.Xj
from (
select 1 as rowid, array("1:3:1", "1:11:2", "2:14:3", "3:19:4") as
features
) t1
LATERAL VIEW feature_pairs(features, "-ffm -feature_hashing 10 -num_fields
5") t2 as i, j, Xi, Xj;
```
Output:
```
t1.rowid t2.i t2.j t2.xi t2.xj
1 0 NULL NULL NULL
1 0 NULL 1.0 NULL
1 16 56 1.0 2.0
1 17 71 1.0 3.0
1 18 96 1.0 4.0
1 1 NULL 2.0 NULL
1 57 71 2.0 3.0
1 58 96 2.0 4.0
1 2 NULL 3.0 NULL
1 73 97 3.0 4.0
1 3 NULL 4.0 NULL
```
Todo:
- Support a case that `field` is not specified e.g., `11:2`
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