Add join column for text columns
Fix source for join column
Doc for join column
Update summary
Fix doc
Fix doc
added italian translation
Merge pull request #628 from ugoariu/italian-translation

added italian translation
Fixed problem with double foreach on the same Iterator
Merge pull request #634 from Mordred/iterator

Fixed problem with double foreach on the same Iterator
Merge remote-tracking branch 'upstream/master' into nullable-filters