Thanks, Erick!
On Tue, May 20, 2014 at 3:55 AM, Erick Erickson <erickerick...@gmail.com>wrote: > This might be useful: > http://searchhub.org/2012/02/23/date-math-now-and-filter-queries/ > > Best, > Erick > > On Mon, May 19, 2014 at 12:09 AM, Dmitry Kan <solrexp...@gmail.com> wrote: > > Thanks, Jack, Alex and Shawn. > > > > This makes proper sense. One win of rounding down on indexing side is > > saving index space, according to hoss (reply over IRC): > > > > "with the TrieDateFields, rounding dates at indexing time won't have any > > effect on the cachability of the rounded queries, and even for non cached > > queries it shouldn't affect the performance much -- but yes, it would > help > > reduce index size" > > > > I haven't tried it myself, just thought to ask if somebody tried it > already. > > > > Dmitry > > > > > > On Sat, May 17, 2014 at 8:37 AM, Shawn Heisey <s...@elyograg.org> wrote: > > > >> On 5/15/2014 1:34 AM, Alexandre Rafalovitch wrote: > >> > I thought the date math rounding was for _caching_ the repeated > >> > queries, not so much the speed of the query itself. > >> > >> Absolutely correct. When NOW is used without rounding, caching is > >> completely ineffective. This is because if the same query using NOW is > >> sent multiple times several seconds apart, every one of those queries > >> will be different after they are parsed and NOW is converted to an > >> actual timestamp. > >> > >> > Also, if you are using TrieDateField, precisionStep value is how > >> > optimization is done. There is bucketing at different level of > >> > precision, so the range search works at the least granular level > >> > first, etc. > >> > >> Some nitty-gritty details of how range queries are accelerated with the > >> Trie data types and precisionStep are described in the Javadoc for > >> NumericRangeQuery: > >> > >> > >> > http://lucene.apache.org/core/4_8_0/core/org/apache/lucene/search/NumericRangeQuery.html > >> > >> Thanks, > >> Shawn > >> > >> > > > > > > -- > > Dmitry Kan > > Blog: http://dmitrykan.blogspot.com > > Twitter: http://twitter.com/dmitrykan > -- Dmitry Kan Blog: http://dmitrykan.blogspot.com Twitter: http://twitter.com/dmitrykan
