Renaud Delbru wrote:
Hi all,

I am wondering if Lucene implements the query optimisation that consists of ordering the posting lists based on the term frequency before intersection ? If yes, could somebody point me to the java class / method that implements such strategy ?

Lucene trunk: ConjunctionScorer, lines 85-103 - pay attention to the comments there, it's not strictly a sort by frequency, rather by the sampled "sparseness".

--
Best regards,
Andrzej Bialecki     <><
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