How do I sort in Solr?
Solr can sort query responses according to:
- Document scores.
- Function results.
- The value of any primitive field (numerics, string, boolean, dates, etc.)
- A SortableTextField which implicitly uses docValues=”true” by default to allow sorting on the original input string regardless of the analyzers used for Searching.
What is defType in Solr?
The defType parameter selects the query parser that Solr should use to process the main query parameter ( q ) in the request. For example: defType=dismax. If no defType param is specified, then by default, the The Standard Query Parser is used. ( eg: defType=lucene )
What is the difference between Q and FQ in Solr?
Standard solr queries use the “q” parameter in a request. Filter queries use the “fq” parameter. The primary difference is that filtered queries do not affect relevance scores; the query functions purely as a filter (docset intersection, essentially).
How do you query in SOLR?
Trying a basic query The main query for a solr search is specified via the q parameter. Standard Solr query syntax is the default (registered as the “lucene” query parser). If this is new to you, please check out the Solr Tutorial. Adding debug=query to your request will allow you to see how Solr is parsing your query.
How does SOLR calculate score?
Lucene uses the TF/IDF scoring algorithm to give initial relevance scores to each document as served up in a search result. You can set all your QF params to be between [0,2] to get a pseudo normalized curve in the QF part of the score influence.
What is DisMax eDisMax in Solr?
The Extended DisMax (eDisMax) query parser is an improved version of the DisMax query parser. In addition to supporting all the DisMax query parser parameters, Extended Dismax: supports the full Lucene query parser syntax. supports queries such as AND, OR, NOT, -, and +.
What are facets in Solr?
Faceting is the arrangement of search results into categories based on indexed terms. Searchers are presented with the indexed terms, along with numerical counts of how many matching documents were found were each term.
What is boost in SOLR?
The “boost” parameter is very similar to the “bf” parameter, but instead of adding its result to the final score, it will multiply it. This is only available in the “Extended Dismax Query Parser” or the “Lucid Query Parser”.
Which is better SOLR or Elasticsearch?
Solr has more advantages when it comes to the static data, because of its caches and the ability to use an uninverted reader for faceting and sorting – for example, e-commerce. On the other hand, Elasticsearch is better suited – and much more frequently used – for timeseries data use cases, like log analysis use cases.
How does solr query work?
Solr works by gathering, storing and indexing documents from different sources and making them searchable in near real-time. It follows a 3-step process that involves indexing, querying, and finally, ranking the results – all in near real-time, even though it can work with huge volumes of data.
Does Solr use TF IDF?
Lucene’s default ranking function uses factors such as tf, idf, and norm to help calculate relevancy scores. Solr has now exposed these factors as function queries. docfreq(field,term) returns the number of documents that contain the term in the field.
How does Solr query work?
What is BQ in SOLR?
The bq (Boost Query) Parameter The bq parameter specifies an additional, optional, query clause that will be added to the user’s main query to influence the score.