Feng Guo created LUCENE-9857:
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Summary: Skip cache building if IndexOrDocValuesQuery choose the
dvQuery
Key: LUCENE-9857
URL: https://issues.apache.org/jira/browse/LUCENE-9857
Project: Lucene - Core
Issue Type: Improvement
Components: core/search
Affects Versions: main (9.0)
Reporter: Feng Guo
IndexOrDocValuesQuery can automatically use dvQueries when the cost > 8 *l
eadcost, And the LRUQueryCache skips cache building when cost > 250(By default)
* leadcost. There is a gap between 8 and 250, which means if the factor is just
between 8 and 250 (e.g. cost = 10 * leadcost), the IndexOrDocValueQuery will
choose the dvQueries but LRUQueryCache still build cache for it.
IndexOrDocValuesQuery aims to speed up queries when the leadcost is small, but
building cache by dvScorers can make it meaningless because it needs to scan
all the docvalues. This can be rather slow for big segments, so maybe we should
skip the cache building for IndexOrDocValuesQuery when it chooses dvQueries.
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