Martijn van Groningen created LUCENE-6352:
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Summary: Add global ordinal based query time join
Key: LUCENE-6352
URL: https://issues.apache.org/jira/browse/LUCENE-6352
Project: Lucene - Core
Issue Type: Improvement
Reporter: Martijn van Groningen
Global ordinal based query time join as an alternative to the current query
time join. The implementation is faster for subsequent joins between reopens,
but requires an OrdinalMap to be built.
This join has certain restrictions and requirements:
* A document can only refer to on other document. (but can be referred by one
or more documents)
* A type field must exist on all documents and each document must be
categorized to a type. This is to distingues between the "from" and "to" side.
* There must be a single sorted doc values field use by both the "from" and
"to" documents. By encoding join into a single doc values field it is trival to
build an ordinals map from it.
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