TAJO-536: Fix warnings in tajo-core-storage. (jinho)
TAJO-372: When an exception except for network issues occurs, the operation should not be repeated.
TAJO-556: java.lang.NoSuchFieldError: IS_SECURITY_ENABLED. (jaehwa)
TAJO-558: HCatalogStore can't scan columns. (jaehwa)
TAJO-560: CTAS PARTITION BY with UNION can cause invalid global plan. (hyunsik)
TAJO-520: Move tajo-core-storage to tajo-storage. (jinho)
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-tajo into WORKER_RECAP