[jira] [Commented] (LUCENE-9945) Extend DrillSideways to support exposing FacetCollectors directly

["ASF subversion and git services (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-9945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17391822#comment-17391822 ] 

ASF subversion and git services commented on LUCENE-9945:
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Commit a76f2f8072d1d345f3eb4b6b96802a28c76c03fc in lucene's branch refs/heads/main from Sejal Pawar
[ https://gitbox.apache.org/repos/asf?p=lucene.git;h=a76f2f8 ]

LUCENE-9945: Extend DrillSidewaysResult to expose drillDowns and drillSideways (#159)



> Extend DrillSideways to support exposing FacetCollectors directly
> -----------------------------------------------------------------
>
>                 Key: LUCENE-9945
>                 URL: https://issues.apache.org/jira/browse/LUCENE-9945
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/facet
>    Affects Versions: main (9.0)
>            Reporter: Greg Miller
>            Priority: Minor
>          Time Spent: 2h 20m
>  Remaining Estimate: 0h
>
> The {{DrillSideways}} logic currently encapsulates, 1) the creation of multiple {{FacetsCollector}} instances, and 2) the processing of those {{FacetsCollectors into a single Facets}} instance. While I suspect this works well for most common cases, and is simple to understand, it's difficult to extend to more advanced cases.
> I propose extending {{DrillSideways}} to support exposing the underlying {{FacetsCollector}} instances if the user needs them, in addition to maintaining the current functionality for all of the more common cases. Specifically, I'd like to add both the "drill down" {{FacetsCollector}} and map of dim -> {{FacetsCollector}} for "drill sideways" to the {{DrillSidewaysResult}} and {{ConcurrentDrillSidewaysResult}} classes. While it's true that a user can extend {{DrillSideways}} and override {{buildFacetsResult}} to keep track of these, it seems reasonable to provide this in {{DrillSideways}} itself so users don't need to sub-class for only this purpose.
> Here are two use-cases illustrating the desire for this:
>  # For certain cases, instead of actually creating a {{Facets}} instance from the {{FacetsCollector}}, I'd like to intersect the {{FacetsCollector}} matching docs with a {{TermEnum}} to do determine whether-or-not at least one match exists. This is useful for a "facet" that can only take on the values "true"/"false", and I want to make sure at least one hit has the value "true".
>  # In another case, I only care about some aggregate statistics for a given facet field. For example, I want to find the min and max values. For this, I want to intersect some doc value field with a {{FacetsCollector}} and only track the min/max values I observe while iterating.



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