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https://issues.apache.org/jira/browse/SOLR-10559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16033700#comment-16033700
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ASF subversion and git services commented on SOLR-10559:
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Commit 057451ac643b134dda3f685c5ffec1b2cdc23dc0 in lucene-solr's branch
refs/heads/master from [~joel.bernstein]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=057451a ]
SOLR-10559: Add tuple documentation
> Add let, get and tuple Streaming Expressions
> --------------------------------------------
>
> Key: SOLR-10559
> URL: https://issues.apache.org/jira/browse/SOLR-10559
> Project: Solr
> Issue Type: New Feature
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Joel Bernstein
> Fix For: 6.6, master (7.0)
>
> Attachments: SOLR-10559.patch, SOLR-10559.patch, SOLR-10559.patch,
> SOLR-10559.patch
>
>
> The *let* and *get* Streaming Expressions allows the tuples in a stream to be
> assigned to a variable so it can be used more then once during an expression.
> This builds on the *list* and *cell* expressions (SOLR-10551)
> Here is the sample syntax:
> {code}
> let(cell(a, expr),
> cell(b, expr),
> list(cell(a, get(a)),
> cell(b, get(b)),
> cell(correlation, correlate(get(a), fielda, get(b), fieldb)))
> {code}
> In the example above the *let* expression is saving the contents of two
> *cell* expressions (a, b). The *get* expression is retrieving the tuples and
> using them later in the expression.
> So for example two facet expressions could be stored in the *let*, and then
> displayed and correlated later in the expression.
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