Struct ExistsQuery 

pub struct ExistsQuery { /* private fields */ }

Query that matches all documents with a non-null value in the specified field.

When querying inside a JSON field, “exists” queries can be executed strictly on the field name or check all the subpaths. In that second case a document will be matched if a non-null value exists in any subpath. For example, assuming the following document where myfield is a JSON fast field:

{
  "myfield": {
    "mysubfield": "hello"
  }
}

With json_subpaths enabled queries on either myfield or myfield.mysubfield will match the document. If it is set to false, only myfield.mysubfield will match it.

All of the matched documents get the score 1.0.

Implementations

impl ExistsQuery

pub fn new_exists_query(field: String) -> ExistsQuery

👎Deprecated

Creates a new ExistQuery from the given field.

This query matches all documents with at least one non-null value in the specified field. This constructor never fails, but executing the search with this query will return an error if the specified field doesn’t exists or is not a fast field.

pub fn new(field: String, json_subpaths: bool) -> Self

Creates a new ExistQuery from the given field.

This query matches all documents with at least one non-null value in the specified field. If json_subpaths is set to true, documents with non-null values in any JSON subpath will also be matched.

This constructor never fails, but executing the search with this query will return an error if the specified field doesn’t exists or is not a fast field.

Trait Implementations

impl Clone for ExistsQuery

fn clone(&self) -> ExistsQuery

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ExistsQuery

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Query for ExistsQuery

fn weight(&self, enable_scoring: EnableScoring<'_>) -> Result<Box<dyn Weight>>

Create the weight associated with a query.

fn explain( &self, searcher: &Searcher, doc_address: DocAddress, ) -> Result<Explanation>

Returns an Explanation for the score of the document.

fn count(&self, searcher: &Searcher) -> Result<usize>

Returns the number of documents matching the query.

fn query_terms<'a>(&'a self, _visitor: &mut dyn FnMut(&'a Term, bool))

Extract all of the terms associated with the query and pass them to the given closure.