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From Shamik Bandopadhyay <>
Subject Does DocValues improve Grouping performance ?
Date Thu, 15 Jan 2015 23:02:05 GMT

   Does use of DocValues provide any performance improvement for Grouping ?
I' looked into the blog which mentions improving Grouping performance
through DocValues.

Right now, Group by queries (which I can't sadly avoid) has become a huge
bottleneck. It has an overhead of 60-70% compared to the same query san
group by. Unfortunately, I'm not able to be CollapsingQParserPlugin as it
doesn't have a support similar to "group.facet" feature.

My understanding on DocValues is that it's intended for faceting and
sorting. Just wondering if anyone have tried DocValues for Grouping and saw
any improvements ?


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