XRow fields public
add getInputs() for AbstractOperation
support distinct on
fix some bugs
use parse double
add RowIterator for XRelation
Merge branch 'master' of https://github.com/XingCloud/XASession2
XRelation.toString dumps all content
when group is not null no projection
Merge branch 'frank'
bugfix for XRowIterator.hasNext()
Merge branch 'master' of https://github.com/XingCloud/XASession2
add less and lessequal
add getColumnIndex to RelationProvider
Merge branch 'master' of https://github.com/XingCloud/XASession2