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Yonik Seeley commented on SOLR-5093: ------------------------------------ bq. Can anyone confess to {! sep=true} It's a placeholder that currently does nothing (and is undocumented)... ignore it, or remove it if it bothers people ;-) > Rewrite field:* to use the filter cache > --------------------------------------- > > Key: SOLR-5093 > URL: https://issues.apache.org/jira/browse/SOLR-5093 > Project: Solr > Issue Type: New Feature > Components: query parsers > Reporter: David Smiley > > Sometimes people writes a query including something like {{field:*}} which > matches all documents that have an indexed value in that field. That can be > particularly expensive for tokenized text, numeric, and spatial fields. The > expert advise is to index a separate boolean field that is used in place of > these query clauses, but that's annoying to do and it can take users a while > to realize that's what they need to do. > I propose that Solr's query parser rewrite such queries to return a query > backed by Solr's filter cache. The underlying query happens once (and it's > slow this time) and then it's cached after which it's super-fast to reuse. > Unfortunately Solr's filter cache is currently index global, not per-segment; > that's being handled in a separate issue. > Related to this, it may be worth considering if Solr should behind the scenes > index a field that records which fields have indexed values, and then it > could use this indexed data to power these queries so they are always fast to > execute. Likewise, {{\[\* TO \*\]}} open-ended range queries could similarly > use this. > For an example of how a user bumped into this, see: > http://lucene.472066.n3.nabble.com/Performance-question-on-Spatial-Search-tt4081150.html -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org