Github user jihoonson commented on the pull request:
https://github.com/apache/tajo/pull/993#issuecomment-212263282
Here is another bug. The result of addition of ```timestamp``` or
```date``` with ```interval``` is invalid.
```
default> \set
...
'TIMEZONE'='Asia/Seoul'
...
default> \d test
table name: default.test
table uri: hdfs://localhost:7020/tajo/warehouse/default/test
store type: TEXT
number of rows: 1
volume: 52 B
Options:
'timezone'='Asia/Seoul'
'text.delimiter'='|'
schema:
t TIME
ts TIMESTAMP
d DATE
default> select ts from test;
ts
-------------------------------
2015-05-01 15:01:23
2016-05-01 16:02:33
(2 rows, 0.03 sec, 0 B selected)
default> select ts + interval '5' day from test;
day
-------------------------------
2015-05-01 15:01:23
2016-05-01 16:02:33
(2 rows, 0.02 sec, 0 B selected)
default> select d from test;
d
-------------------------------
2015-05-01
2016-05-01
(2 rows, 0.018 sec, 0 B selected)
default> select d + interval '5' day from test;
day
-------------------------------
2015-05-01 00:00:00
2016-05-01 00:00:00
(2 rows, 0.016 sec, 0 B selected)
default> select ts from test;
ts
-------------------------------
2015-05-01 15:01:23
2016-05-01 16:02:33
(2 rows, 0.018 sec, 0 B selected)
default> select ts - interval '5' day from test;
day
-------------------------------
2015-05-01 15:01:23
2016-05-01 16:02:33
(2 rows, 0.014 sec, 0 B selected)
default> select d from test;
d
-------------------------------
2015-05-01
2016-05-01
(2 rows, 0.027 sec, 0 B selected)
default> select d - interval '5' day from test;
day
-------------------------------
2015-05-01 00:00:00
2016-05-01 00:00:00
(2 rows, 0.017 sec, 0 B selected)
```
It is weird because tests for interval datum are already included.
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