Github user hyunsik commented on the pull request:
https://github.com/apache/tajo/pull/13#issuecomment-46634343
@jihoonson They also have restrictions. Please take a look at the below
description of the link as follows:
```
Restrictions are that frame_start cannot be UNBOUNDED FOLLOWING, frame_end
cannot be UNBOUNDED PRECEDING, and the frame_end choice cannot appear earlier
in the above list than the frame_start choice â for example RANGE BETWEEN
CURRENT ROW AND value PRECEDING is not allowed.
```
The main difference is that we have the restrictions in parser level, yet
PostgreSQL has the same restrictions in the planner level.
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