TAJO-620: A join query can cause IndexOutOfBoundsException if one of tables is empty. (jaehwa)
TAJO-635: Improve tests of query semantic verification.
TAJO-640: In inner join clause, empty table can cause a error by order-by clause. (jaehwa)
Almost complted.
Fixed doc compile error.
Add building.
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-tajo into tajo-docs
Fixed.
changed css.
Fixed theme.