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https://issues.apache.org/jira/browse/SOLR-6350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14091536#comment-14091536
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Hoss Man commented on SOLR-6350:
--------------------------------
Proposed implementation...
* Add Ted Dunnings [t-digest|https://github.com/tdunning/t-digest] as a
dependency
* Build up an
[ArrayDigets|https://github.com/tdunning/t-digest/blob/master/src/main/java/com/tdunning/math/stats/ArrayDigest.java]
in NumericStatsValues.accumulate()
* in distributed mode, each shard should return ArrayDigest.asSmallBytes()
base64 encoded - the coordinator node should use ArrayDigest.fromBytes() &
AbstractTDigest.add(TDigest) to merge the results
* percentiles should *not* be enabled by default - they really need a param to
control which percentiles (if any) should be computed.
> Percentiles in StatsComponent
> -----------------------------
>
> Key: SOLR-6350
> URL: https://issues.apache.org/jira/browse/SOLR-6350
> Project: Solr
> Issue Type: Sub-task
> Reporter: Hoss Man
>
> Add an option to compute user specified percentiles when computing stats
> Example...
> {noformat}
> stats.field={!percentiles='1,2,98,99,99.999'}price
> {noformat}
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