[jira] [Commented] (SOLR-15132) Add window paramater to the nodes Streaming Expression

["Houston Putman (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-15132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17278222#comment-17278222 ] 

Houston Putman commented on SOLR-15132:
---------------------------------------

If this is just looking at the last {{n}} buckets when {{window=n}}, then why does the bucket field need to be an ISO timestamp in a string field?

> Add window paramater to the nodes Streaming Expression
> ------------------------------------------------------
>
>                 Key: SOLR-15132
>                 URL: https://issues.apache.org/jira/browse/SOLR-15132
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: streaming expressions
>            Reporter: Joel Bernstein
>            Priority: Major
>
> The *nodes* Streaming Expression performs a breadth first graph traversal. This ticket will add a *window* parameter to allow the nodes expression to traverse the graph within a window of time. 
> To take advantage of this feature you must index the content with a String field which is an ISO timestamp truncated at ten seconds. Then the *window* parameter can be applied to walk the graph within a *window prior* to a specific ten second window and perform aggregations. 
> Here is an example using Solr logs to answer the following question: 
> What types of log events occurred in the 30 second window prior to 10 second windows with the most slow queries:
> {code}
> nodes(facet(logs, q="qtime_s:[5000 TO *]", buckets="time_ten_seconds", rows="25"),
>       walk="time_ten_seconds->time_ten_seconds",
>       window="3",
>       gather="type_s",
>       count(*))
> {code}



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