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Comment by HCIdivision17 | Hacker News Reader

I'm not sure I understand; doesn't

  BOOK.LANGUAGE.eq("DE")

mean something like

  Book.Language = 'DE'

in SQL? That's certainly a boolean expression. I've only started reading the manual, though, so it's possible I got the semantics wrong, but I've had SSMS point out to me this sort of thing before.

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If we had selected from or joined on BOOK, it would be a Boolean expression. But in this case, BOOK is undefined, so BOOK.LANGUAGE.eq("DE") shouldn't type check at all.

The corresponding SQL is nonsensical:

    select * from AUTHOR where BOOK.LANGUAGE = 'DE'

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