format Javadoc <= 80 columns
rowdata joins recursive (worked already)
TODOs
table knows its unique Column Indices
introduce Table Builder for test data
refactor: extract column container from Table
refactor: extract meta data column container from TableMetaData
remove TODO
remove unique flag in column meta data again, it is not true any more
after fk explosion and columns meta data is copied around
use columns in IDColumn instead of passing around all unique column
indices and counts
extract column order and unique column identification into
ColumnSelector classes, ignore additional unique columns in IdColumn