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https://issues.apache.org/jira/browse/SOLR-12441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16537081#comment-16537081
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David Smiley commented on SOLR-12441:
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bq. Perhaps this discussion should be moved to the ChildDocTransformer ticket
Sure. This issue can be focused on what fields should be added and when and
what their values look like. Perhaps some other issue will ultimately add
these new fields to a non-test schema and we'll need to then know how we need
to index it. At the moment we have an opt-in feature that requires the user
opting in to not only add the URP but add the fields to their schema and know
which field types should be used.
> Add deeply nested documents URP
> -------------------------------
>
> Key: SOLR-12441
> URL: https://issues.apache.org/jira/browse/SOLR-12441
> Project: Solr
> Issue Type: Sub-task
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: mosh
> Assignee: David Smiley
> Priority: Major
> Time Spent: 7h
> Remaining Estimate: 0h
>
> As discussed in
> [SOLR-12298|https://issues.apache.org/jira/browse/SOLR-12298], there ought to
> be an URP to add metadata fields to childDocuments in order to allow a
> transformer to rebuild the original document hierarchy.
> {quote}I propose we add the following fields:
> # __nestParent__
> # _nestLevel_
> # __nestPath__
> __nestParent__: This field wild will store the document's parent docId, to be
> used for building the whole hierarchy, using a new document transformer, as
> suggested by Jan on the mailing list.
> _nestLevel_: This field will store the level of the specified field in the
> document, using an int value. This field can be used for the parentFilter,
> eliminating the need to provide a parentFilter, which will be set by default
> as "_level_:queriedFieldLevel".
> _nestLevel_: This field will contain the full path, separated by a specific
> reserved char e.g., '.'
> for example: "first.second.third".
> This will enable users to search for a specific path, or provide a regular
> expression to search for fields sharing the same name in different levels of
> the document, filtering using the level key if needed.
> {quote}
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