Thanks Adrien, this is very helpful. I have just read your blog post about this <https://www.elastic.co/blog/better-query-execution-coming-elasticsearch-2-0>, the two-phase iteration is really cool!
2016-07-31 20:17 GMT+01:00 Adrien Grand <jpou...@gmail.com>: > Lucene 5.0 introduced two-phase iteration > (see Scorer.twoPhaseIterator()) as a way to tackle slow queries. In short, > queries can be split into a fast approximation and a slower confirmation > and Lucene makes sure to reach agreement between the different > approximations of a BooleanQuery before checking the confirmations. > > Both approximations and confirmations have an API that allows them to > expose a "cost" and the least costly components are always evaluated before > the most costly ones. So the filter strategy is not useful anymore, every > decision is made based on these cost APIs. > > > Le ven. 22 juil. 2016 à 15:32, Andres de la Peña <adelap...@stratio.com> a > écrit : > > > Hi all, > > > > Suppose that we have a boolean query composed by two filtering queries, > > where one of them is fast and the other is slow: > > > > BooleanQuery.Builder builder = new BooleanQuery.Builder(); > > builder.add(fastQuery, FILTER); > > builder.add(slowQuery, FILTER); > > Query query = builder.build(); > > > > > > How is the intersection between the two sub-queries calculated? Is the > > order in which they are added to the boolean query relevant? Is there > > something we could do to take advantage of my knowledge about the > expected > > performance of the sub-queries? > > > > Prior to Lucene 6.0 there was a FilteredQuery.FilterStrategy providing > some > > control about this. Is there something analogous in Lucene 6.0? > > > > Thanks in advance, > > > > -- > > Andrés de la Peña > > > > Vía de las dos Castillas, 33, Ática 4, 3ª Planta > > 28224 Pozuelo de Alarcón, Madrid > > Tel: +34 91 828 6473 // www.stratio.com // *@stratiobd > > <https://twitter.com/StratioBD>* > > > -- Andrés de la Peña Vía de las dos Castillas, 33, Ática 4, 3ª Planta 28224 Pozuelo de Alarcón, Madrid Tel: +34 91 828 6473 // www.stratio.com // *@stratiobd <https://twitter.com/StratioBD>*
