Chetan Mehrotra created OAK-6333:
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Summary: IndexPlanner should use actual entryCount instead of
limiting it to 1000
Key: OAK-6333
URL: https://issues.apache.org/jira/browse/OAK-6333
Project: Jackrabbit Oak
Issue Type: Improvement
Components: lucene
Reporter: Chetan Mehrotra
Assignee: Chetan Mehrotra
Fix For: 1.8
Currently IndexPlanner uses following logic for estimating the entryCount
# If the index has fulltext indexing enable then
## If {{entryCount}} value is defined then min(entryCount, numOfDocs)
## If not then use the {{numDocs}} i.e. actual entry count
# If the index is pure property index i.e. none of the property definitions
have {{analyzed}} set to true
## Take min(1000, numDocs)
Revisiting the logic for #2 it appears in 1.0.x days (OAK-2200) we capped it to
1000 because cost estimation for property indexes was inaccurate (they used to
report low values causing lucene index to loose).
With support for Counters the cost estimation for property index has improved
and now we should remove this capping and let it use numDocs.
One area where it causes issue is when we have two indexes where one is
superset of other. For e.g. /oak:index/asset and /content/en/ /oak:index/asset
where both have some matching properties. Logically if query can be handled by
sub index then it should get picked but currently either of them can be picked
making query plan undeterministic
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