: Subject: Re: Is it possible to search for the empty string? : : Not out of the box. : : Fields are parsed into tokens and queries search on tokens. An empty : string has no tokens for that field and a missing field has no tokens : for that field.
that's a missleading over simplification of what *normally* happens. it is absolutely possible to have documents with fields whose indexed temrs consist of the empty string, and to search for those empty strings -- the most trivial way being with a simple StrField -- but using TExtField with some creative analyzers it's also very possible.. $ curl 'http://localhost:8983/solr/techproducts/select?q=*:*&facet=true&facet.field=foo_s&wt=json&indent=true&omitHeader=true' { "response":{"numFound":3,"start":0,"docs":[ { "id":"foo_blank", "foo_s":"", "_version_":1501816569733316608}, { "id":"foo_non_blank", "foo_s":"bar", "_version_":1501816583564034048}, { "id":"foo_missing", "_version_":1501816591383265280}] }, "facet_counts":{ "facet_queries":{}, "facet_fields":{ "foo_s":[ "",1, "bar",1]}, "facet_dates":{}, "facet_ranges":{}, "facet_intervals":{}, "facet_heatmaps":{}}} $ curl 'http://localhost:8983/solr/techproducts/select?q=foo_s:""&wt=json&indent=true&omitHeader=true' { "response":{"numFound":1,"start":0,"docs":[ { "id":"foo_blank", "foo_s":"", "_version_":1501816569733316608}] }} $ curl 'http://localhost:8983/solr/techproducts/select?q=foo_s:*&wt=json&indent=true&omitHeader=true' { "response":{"numFound":2,"start":0,"docs":[ { "id":"foo_blank", "foo_s":"", "_version_":1501816569733316608}, { "id":"foo_non_blank", "foo_s":"bar", "_version_":1501816583564034048}] }} $ curl 'http://localhost:8983/solr/techproducts/select?q=-foo_s:*&wt=json&indent=true&omitHeader=true' { "response":{"numFound":1,"start":0,"docs":[ { "id":"foo_missing", "_version_":1501816591383265280}] }} -Hoss http://www.lucidworks.com/
