[SOLR-8998] JSON Facet API child roll-ups

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 7.4, 8.0
• Component/s: Facet Module
• Assignee: Mikhail Khludnev
• Reporter: Yonik Seeley
• Created: 15/Apr/16 15:27
• Updated: 22/Apr/20 20:22
• Resolved: 02/May/18 15:24

Description

The JSON Facet API currently has the ability to map between parents and children ( see http://yonik.com/solr-nested-objects/ )
This issue is about adding a true rollup ability where parents would take on derived values from their children. The most important part (and the most difficult part) will be the external API.

[~mkhludnev] says

The bottom line is to introduce uniqueBlock(_root_) aggregation, which is supposed to be faster than unique(_root_) and purposed for blocked index only. For now it it supports singlevalue string fields, docValues usually make sense.

Issue Links

• causes: SOLR-12875 ArrayIndexOutOfBoundsException when using uniqueBlock(_root_) in JSON Facets
• is related to: SOLR-9510 child level facet exclusions
• relates to: SOLR-7830 topdocs facet function
• relates to: SOLR-12324 handling numeric fields in uniqueBlock(id) aggregation for JSON Facet
• relates to: SOLR-12325 introduce uniqueBlockQuery(parent:true) aggregation for JSON Facet
• relates to: SOLR-9683 include/exclude filters by tag
• links to: attempt to get filter exclusions at the single request