TAJO-1022: tsql does not work as background process

[babokim]

No description provided.

[jihoonson]

+1
Great!

[hyunsik]

When this patch is applied, the arrow and esc keys does not work anymore. As a temporary solution, we can add some option for non-interactive mode for background job. How do you think?

[babokim]

Nice catch hyunsik. I did't realize that problem.
I found that hive shell have same problem. See the following site.
https://issues.apache.org/jira/browse/HIVE-6758
Hive does not support "jline.UnsupportedTerminal" option, but documented a workaround.

In my opinion many tajo query will be run as background mode, so background mode option is good to user.
What do you think about "-B" as background mode option like the bellow.

"bin/tsql -B -t test.sql &"

[babokim]

I pushed new patch. I added "-B" option for running CLI as background. This is a temporal solution. If you find a better way this patch should be replaced.

[hyunsik]

It needs rebase. Also, I have one suggestion. We have used lower case characters as options. Like -B, -b also can indicate background. Do you have any reason using upper case?

[babokim]

There is no special reason. I thought that this mode is not a typical mode so I used 'B' instead of 'b'.

[hyunsik]

+1

Ship it.