Joel Bernstein created SOLR-14478:
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Summary: Allow diff Stream Evaluator to operate on a matrix
Key: SOLR-14478
URL: https://issues.apache.org/jira/browse/SOLR-14478
Project: Solr
Issue Type: New Feature
Security Level: Public (Default Security Level. Issues are Public)
Components: streaming expressions
Reporter: Joel Bernstein
Currently the *diff* function performs serial differencing on a numeric vector.
This ticket will allow the diff function to perform serial differencing on all
the rows of a *matrix*. This will make it easy to perform *correlations* on
*differenced time series matrices* using math expressions.
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