.
more log
check null outcome
bugfix for async
propergate root cause exceptions
check outcome null
fix for kill sequence
more log about null
more log on null
screen batch error handling
potential bugfix for union
test rkFilter;basicoptimizer
add some tests
Merge branch 'i20' into i33
HBaseClientScanner -> DirectScanner
Merge remote-tracking branch 'origin/i20' into i20
optimize dfa parser
Merge branch 'i20' into i33
Change basic optimezer
Merge remote-tracking branch 'origin/i20' into i20