Chris M. Hostetter created SOLR-15079:
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Summary: Block Collapse (faster collapse code when groups are
co-located via Block Join style nested doc indexing)
Key: SOLR-15079
URL: https://issues.apache.org/jira/browse/SOLR-15079
Project: Solr
Issue Type: New Feature
Security Level: Public (Default Security Level. Issues are Public)
Reporter: Chris M. Hostetter
Assignee: Chris M. Hostetter
A while back, JoelB had an idea for an optimized version of of the logic in the
CollapsingQParserPlugin to take advantage of collapsing on fields where the
user could knows that every doc with the same collapseKey were contiguous in
the index - for example collapsing on the {{_root_}} field.
Joel whipped up an initial PoC patch internally at lucidworks that only dealt
with some limited cases (string field collapsing w/o any nulls, using default
group head selection) to explain the idea, but other priorities prevented him
from doing thorough benchmarking or flesh it out into "production ready" code.
I took Joel's original PoC and fleshed it out with unit tests, fixed some bugs,
and did some benchmarking against large indexes - the results look really good.
I've since then beefed the code up more to include collapsing on numeric
fields, and added support for all group head selector types, as well as adding
support for {{nullPolicy=expand}}.
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