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From "Joel Bernstein (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (SOLR-10559) Add let and get Streaming Expressions
Date Mon, 24 Apr 2017 19:03:04 GMT

    [ https://issues.apache.org/jira/browse/SOLR-10559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15981684#comment-15981684
] 

Joel Bernstein edited comment on SOLR-10559 at 4/24/17 7:02 PM:
----------------------------------------------------------------

First pass at the implementations. No tests yet.


was (Author: joel.bernstein):
First pass at the implementations. Not tests yet.

> Add let and get 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
>         Attachments: 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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