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Use PriorityQueue instead of TreeMap in FirstPassGroupingCollector.

module:grouping

Status: Draft (not ready).

apache/lucenenumber 14813

#14813 In apache/lucene;

· vsop-479 opened on Jun 19, 2025

Speed up GroupingSelectors when using a descending sort on a high cardinality field

module:grouping

type:enhancement

Status: Open.

#13664 In apache/lucene;

· HoustonPutman opened on Aug 16, 2024

Sorting by DocValues while grouping is slower than old good FieldCache [LUCENE-9328]

legacy-jira-priority:Major

module:grouping

type:enhancement

Status: Open.

#10368 In apache/lucene;

· asfimport opened on Apr 17, 2020

Refactor TestGrouping.java to break TestRandom into separate tests [LUCENE-5065]

affects-version:4.3.1

legacy-jira-priority:Minor

module:grouping

type:test

Status: Open.

#6129 In apache/lucene;

· asfimport opened on Jun 18, 2013

Improve AllGroupsCollector implementations [LUCENE-3972]

legacy-jira-priority:Major

module:grouping

type:enhancement

Status: Open.

#5045 In apache/lucene;

· asfimport opened on Apr 11, 2012

Nested Field Collapsing [LUCENE-3257]

legacy-jira-priority:Major

module:grouping

type:enhancement

Status: Open.

#4330 In apache/lucene;

· asfimport opened on Jun 29, 2011

Cascaded grouping [LUCENE-3122]

legacy-jira-fix-version:4.9

legacy-jira-fix-version:6.0

legacy-jira-label:gsoc2014

legacy-jira-priority:Major

module:grouping

type:enhancement

Status: Open.

#4195 In apache/lucene;

· asfimport opened on May 19, 2011