[SOLR-14478] Allow the diff Stream Evaluator to operate on the rows of a matrix

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Resolved
• Fix Version/s: 8.6
• Component/s: streaming expressions
• Assignee: Joel Bernstein
• Reporter: Joel Bernstein
• Created: 13/May/20 11:21
• Updated: 15/Jul/20 15:09
• Resolved: 14/May/20 22:34

Description

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 a matrix of differenced time series vectors using math expressions.

A screen shot is attached with diff working on a matrix of time series data. The effect is powerful. It removes the trend from a matrix of time series vectors in one simple function call.