Github user jihoonson commented on the pull request:
https://github.com/apache/tajo/pull/422#issuecomment-100076808
Thanks. I've verified that join and aggregation queries work well. Really
nice patch.
The one thing I'd like to comment is that it needs to improve the error
message.
Here is an example case.
```
default> select title, name.first_name, name.last_name from test t1, test
t2 where t1.name.last_name = t2.name.last_name;
ERROR: column "title" does not exist
default> select name.first_name, name.last_name from test t1, test t2 where
t1.name.last_name = t2.name.last_name;
ERROR: column name name.first_name is ambiguous
```
It would be great if the ambiguous exception occurs for the first case.
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