I want realize multiple joins in lucene.
Considering the complexy of joining i want i will skip index join.
first strategy :
Query-time joins
String fromField = "from"; // Name of the from field
boolean multipleValuesPerDocument = false; // Set only yo true in
the case when your fromField has multiple values per document in your
index
String toField = "to"; // Name of the to field
ScoreMode scoreMode = ScoreMode.Max // Defines how the scores are
translated into the other side of the join.
Query fromQuery = new TermQuery(new Term("content", searchTerm)); //
Query executed to collect from values to join to the to values
Query joinQuery = JoinUtil.createJoinQuery(fromField,
multipleValuesPerDocument, toField, fromQuery, fromSearcher,
scoreMode);
TopDocs topDocs = toSearcher.search(joinQuery, 10); // Note:
toSearcher can be the same as the fromSearcher
// Render topDocs...
*First question is: *
*it possible to use joinedQuery in nested way(if i have 2 joins to 2
different entities for example)? *
*main query -> nested inside first join -> nested in the second join,...*
Query-custom joins
I could realize a mini class Loader making joins:
1) every entity is a different class
2) by reflection if the getter is class ==entity .... Loader load document
with the key saved in parent object.
*second question:*
*this solution is essentially similar to how it works the query times or
not (so similar performance)?*
