[ENH] Merge data allows matching by multiple pairs of columns#3919

Merged

ajdapretnar merged 11 commits into

biolab:masterfrom

janezd:owmergedata-multiple-attrs

Jul 30, 2019

Commits on Jul 27, 2019

Commits on Jul 30, 2019

OWMergeData: Fix ids and duplicated columns in outer join
janezd
committed
Table: Properly iitialize missing values (empty strings, not nans for StringVariable)
janezd
committed