RavenDB-22410 Search - analyzer produces multiple tokens from a singl…

…e words

src/Corax/Querying/IndexSearcher.Search.cs

@@ -214,6 +214,10 @@ private IQueryMatch SearchQueryWithPhraseQuery(FieldMetadata field, IEnumerable<
                     termMatches ??= new();
                     terms.Clear(); // Clear the terms list.
                     EncodeAndApplyAnalyzerForMultipleTerms(field, word, ref terms);
+
+                    //When single term outputs multiple terms we've to jump into phraseQuery
+                    if (terms.Count > 1)
+                        goto PhraseQuery;
 
                     foreach (var term in terms.GetEnumerator())
                     {
@@ -264,9 +268,10 @@ private IQueryMatch SearchQueryWithPhraseQuery(FieldMetadata field, IEnumerable<
             //Phrase query
             terms.Clear();
             EncodeAndApplyAnalyzerForMultipleTerms(field, word, ref terms);
+
             if (terms.Count == 0) 
                 continue; //sentence contained only stop-words
-
+            PhraseQuery:
             var hs = new HashSet<Slice>(SliceComparer.Instance);
             for (var i = 0; i < terms.Count; ++i)
             {

test/SlowTests/Issues/RavenDB_22410.cs

@@ -0,0 +1,36 @@
+using System.Linq;
+using FastTests;
+using Raven.Client.Documents;
+using Tests.Infrastructure;
+using Xunit;
+using Xunit.Abstractions;
+
+namespace SlowTests.Issues;
+
+public class RavenDB_22410 : RavenTestBase
+{
+    public RavenDB_22410(ITestOutputHelper output) : base(output)
+    {
+    }
+
+    [RavenTheory(RavenTestCategory.Querying)]
+    [RavenData(SearchEngineMode = RavenSearchEngineMode.All)]
+    public void SearchMethodWhenWordIsTransformedIntoMultipleTokensWeTreatThemAsPhraseQuery(Options options)
+    {
+        using var store = GetDocumentStore(options);
+        using var session = store.OpenSession();
+        session.Store(new Dto("Din ner"), "Dtos/1");
+        session.Store(new Dto("Ner din"), "Dtos/2");
+        session.SaveChanges();
+
+        var results = session.Query<Dto>()
+            .Customize(x => x.WaitForNonStaleResults())
+            .Search(x => x.Search, "din%ner")
+            .ToList();
+
+        Assert.Equal(1, results.Count);
+        Assert.Equal("Dtos/1", results[0].Id);
+    }
+
+    private record struct Dto(string Search, string Id = null);
+}