SpellIndex
- Namespace
- Rowles.LeanLucene.Search.Suggestions
- Assembly
- Rowles.LeanLucene.dll
Pre-built character-trigram inverted index for fast spelling correction. Build once via Build(IndexSearcher, string), then call Suggest(string, int, int) per query. This mirrors Lucene.NET's SpellChecker pattern: amortise the dictionary scan at build time, achieve near-constant-time lookups at query time.
public sealed class SpellIndex
TermCount
The number of unique terms in this index.
Build(IndexSearcher, string)
Builds a SpellIndex for the given field by extracting all unique terms from the segment readers and constructing a trigram inverted index. This is an O(T * L) operation where T is the unique term count and L is average term length. Call once and reuse for multiple Suggest(string, int, int) calls.
BuildFromTerms(IEnumerable<(string Term, int DocFreq)>)
Builds a SpellIndex for the given field from pre-collected term/docFreq pairs. Useful for testing without an IndexSearcher.
Suggest(string, int, int)
Suggests corrections for the given query term. The overlap counts array is rented from System.Buffers.ArrayPool`1 so repeated calls allocate only the small result list.