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Each such extended biword is now made a term in the

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Unformatted text preview: sum of its doc. freq.’s (conserva*ve). §༊  Process in increasing order of OR sizes. 43 Introduc)on to Informa)on Retrieval Exercise §༊  Recommend a query processing order for (tangerine OR trees) AND (marmalade OR skies) AND (kaleidoscope OR eyes) §༊  Which two terms should we process first? Term eyes kaleidoscope marmalade skies tangerine trees Freq 213312 87009 107913 271658 46653 316812 44 Introduc)on to Informa)on Retrieval Query processing exercises §༊  Exercise: If the query is friends AND romans AND (NOT countrymen), how could we use the freq of countrymen? §༊  Exercise: Extend the merge to an arbitrary Boolean query. Can we always guarantee execu*on in *me linear in the total pos*ngs size? §༊  Hint: Begin with the case of a Boolean formula query: in this, each query term appears only once in the query. 45...
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