Henrik Hertel created LUCENE-10562:
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Summary: Large system: Wildcard search leads to full index scan
despite filter query
Key: LUCENE-10562
URL: https://issues.apache.org/jira/browse/LUCENE-10562
Project: Lucene - Core
Issue Type: Bug
Components: core/search
Affects Versions: 8.11.1
Reporter: Henrik Hertel
I use Solr and have a large system with 1TB in one core and about 5 million
documents. The textual content of large PDF files is indexed there. My query is
extremely slow as soon as I use wildcards e.g. *searchvalue*, even though I put
a filter query in front of it that reduces to less than 20 documents.
searchvalue -> less than 1 second
searchvalue* -> less than 1 second
*searchvalue* -> more than 30 seconds
My query:
select?defType=lucene&q=content_t:*searchvalue*&fq=metadataitemids_is:20950&fq=renditions_ss%3A*&fl=id&rows=50&start=0
I've tried everything imaginable. It doesn't make sense to me why a search over
a small subset should take so long. If I omit the filter query
metadataitemids_is:20950, so search the entire inventory, then it also takes
the same amount of time. Therefore, I suspect that despite the filter query,
the main query runs over the entire index.
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