TAJO-984: Improve the default data type handling in RowStoreUtil. (jihoon via hyunsik)
TAJO-1011: EvalTreeUtil::isJoinQual need to handle other join conditions. (jaehwa)
TAJO-704: TajoMaster HA (jaehwa)
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/tajo into TAJO-1010
TAJO-1008: Protocol buffer De/Serialization for EvalNode.
TAJO-1013: a complex equality condition including columns of the same table is recognized as a join condition.

Closes #123
Revert "TAJO-1008: Protocol buffer De/Serialization for EvalNode."

This reverts commit 49d52553c5e4ef37a6af4605befbe36b0dd36c3c.
TAJO-1008: Protocol buffer De/Serialization for EvalNode.
TAJO-992: Reduce number of hash shuffle output file.
Closes #115
TAJO-931: Output file can be punctuated depending on the file size. (hyunsik)

Closes #119
TAJO-1004: UniformRangePartition cannot deal with unicode ranges.

Closes #116
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/tajo into TAJO-1010
Added DistinctNullDatum