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https://issues.apache.org/jira/browse/SOLR-14481?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joel Bernstein reassigned SOLR-14481:
-------------------------------------
Assignee: Joel Bernstein
> Add drill Streaming Expression
> ------------------------------
>
> Key: SOLR-14481
> URL: https://issues.apache.org/jira/browse/SOLR-14481
> Project: Solr
> Issue Type: New Feature
> Security Level: Public(Default Security Level. Issues are Public)
> Components: streaming expressions
> Reporter: Joel Bernstein
> Assignee: Joel Bernstein
> Priority: Major
>
> This ticket will add the *drill* Streaming Expression. The drill Streaming
> Expression is a wrapper around the functionality that described in
> SOLR-14470. The idea is for drill to contact the /export handler in a replica
> for each in a collection pass four parameters:
> * q: query
> * fl: field list
> * sort: sort spec
> * expr: Streaming Expressions.
> The export handler will pass the result set through the streaming expression
> performing an aggregation on the sorted result set and return the aggregated
> tuples. The drill expression will simply maintain the sort order of the
> tuples and emit them so that a wrapper expression can perform operations on
> the sorted aggregate tuples.
> Sample syntax:
> {code:java}
> drill(collection1, q="*:*", fl=a,b,c, sort="a desc, b desc",
> expr="rollup(input(), over="a, b", sum(c))") {code}
> In order to finish the aggregation other expressions can be used:
> {code:java}
> rollup(
> select(
> drill(collection1,
> q="*:*",
> fl=a,b,c, sort="a desc, b desc",
> expr="rollup(input(), over="a, b", sum(c))"),
> a,
> b,
> sum(c) as sums),
> over="a, b",
> sum(sums))
>
> {code}
> This provides fast aggregation over fields with infinite cardinality.
>
>
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