[jira] [Commented] (OAK-6333) IndexPlanner should use actual entryCount instead of limiting it to 1000

["Chetan Mehrotra (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OAK-6333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16044086#comment-16044086 ] 

Chetan Mehrotra commented on OAK-6333:
--------------------------------------

Fixing this is simple but we need to decide if we should change the default behaviour or make it depend on some flag. For now I think

# trunk - Change the default behaviour
# Branches - Provide a flag to enable this behaviour

[~tmueller] [~catholicon] [~amitj_76] Thoughts?

> 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
> ## If {{entryCount}} value is defined then min(entryCount, numOfDocs)
> ## Else 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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