Ignacio Vera created LUCENE-9287:
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Summary: Never cache DocValuesFieldExistsQuery
Key: LUCENE-9287
URL: https://issues.apache.org/jira/browse/LUCENE-9287
Project: Lucene - Core
Issue Type: Improvement
Reporter: Ignacio Vera
Currently {{DocValuesFieldExistsQuery}} is cached if there are no DV updates on
the field in question. This query is pretty efficient and some experiments show
that caching the result might be much more expensive than the benefits we get
from caching the result.
For example, indexing 10 million documents with long values and then executing
this query:
* without caching it takes around 1ms to run.
* with caching it takes around 40ms to run and the size of the cache is around
1MB (1212792 bytes).
I wonder if we should never cache this query as it seems the overhead of
caching the results is not worthy.
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