Thank you for your advice, Jihoon Son! The second choice you've given looks good to me.
Up to now, I tested creating a new ORC table and selecting that empty table. Both cases are okay, so I made a pull request.
However, your advice is right for
TAJO-1463, I had better add error handling codes like throwing 'Not Implemented' exception for non-empty table. In addition, for TAJO-1464, I will also add error handling codes for insert statements into ORC tables.
Thank you again!