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Fields
We sometimes wish to search by these metadata
E.g., find docs authored by William Shakespeare in the year 1601, containing alas poor Yorick
Year = 1601 is an example of a field
Also, author last name = shakespeare, etc.
Field or parametric index: postings for each field value
Sometimes build range trees (e.g., for dates)
Field query typically treated as conjunction
(doc must be authored by shakespeare)
Speaker notes:
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