paginator, containable -> what $key for sort()

Hello,

I am using containable behaviour in paginate() in my controller namend
"E".

In my view I can use sort('title of cell in table E') to sort the
results. But I did not find a way to sort by any fields not belonging
to table E.

I tried sort('D.cell name') - but the syntax seems to be wrong.

So, what is the correct syntax for $key in PaginatorHelper::sort()
when using containble behaviour?

Thanks!
Melanie
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