Robert Muir created LUCENE-5399:
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Summary: PagingFieldCollector is very slow with String fields
Key: LUCENE-5399
URL: https://issues.apache.org/jira/browse/LUCENE-5399
Project: Lucene - Core
Issue Type: Bug
Components: core/search
Reporter: Robert Muir
Attachments: LUCENE-5399.patch
PagingFieldCollector (sort comparator) is significantly slower with string
fields, because of how its "seen on a previous page" works: it calls
compareDocToValue(int doc, T t) first to check this. (its the only user of this
method)
This is very slow with String, because no ordinals are used. so each document
must lookup ord, then lookup bytes, then compare bytes.
I think maybe we should replace this method with an 'after' slot, and just have
compareDocToAfter or something.
Otherwise we could use a hack-patch like the one i will upload (i did this just
to test the performance, although tests do pass).
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