vlad-lyutenko

I tried to understand what is going in this PR, let me try to summarise it and please correct me if I am wrong or miss something. When we process...

> Is there some other solution you can think of? One idea which I was thinking was to expose all internal columns as a `ROW` type with multiple fields instead...

> > Looks like current exception is coming somewhere from core/engine (not from connector). > > So maybe we can add such check on column collision inside connector, with more...

I am ok with changes

lgtm