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IndexWriter.addDocuments(java.util.Collection)
.
See:
Description
Class Summary | |
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BlockJoinCollector | Collects parent document hits for a Query containing one more more BlockJoinQuery clauses, sorted by the specified parent Sort. |
BlockJoinQuery | This query requires that you index
children and parent docs as a single block, using the
IndexWriter.addDocuments(java.util.Collection or IndexWriter.updateDocuments(org.apache.lucene.index.Term, java.util.Collection API. |
Enum Summary | |
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BlockJoinQuery.ScoreMode |
This module supports index-time joins while searching, where joined
documents are indexed as a single document block using
IndexWriter.addDocuments(java.util.Collection
. This is useful for any normalized content (XML documents or database tables). In database terms, all rows for all
joined tables matching a single row of the primary table must be
indexed as a single document block, with the parent document
being last in the group.
When you index in this way, the documents in your index are divided
into parent documents (the last document of each block) and child
documents (all others). You provide a Filter
that identifies the
parent documents, as Lucene does not currently record any information
about doc blocks.
At search time, use BlockJoinQuery
to remap
matches from any child Query
(ie, a query that matches only
child documents) up to the parent document space. The resulting
BlockJoinQuery
can then be used as a clause in any query that
matches parent documents.
If you only care about the parent documents matching the query, you
can use any collector to collect the parent hits, but if you'd also
like to see which child documents match for each parent document,
use the BlockJoinCollector
to collect the hits. Once the
search is done, you retrieve a TopGroups
instance from the
BlockJoinCollector.getTopGroups(org.apache.lucene.search.join.BlockJoinQuery, org.apache.lucene.search.Sort, int, int, int, boolean)
method.
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