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https://issues.apache.org/jira/browse/CASSANDRA-8910?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Stupp updated CASSANDRA-8910:
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Labels: UDF doc-impacting (was: )
> Conditional update based on UDF
> -------------------------------
>
> Key: CASSANDRA-8910
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8910
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Brian ONeill
> Priority: Minor
> Labels: UDF, doc-impacting
> Fix For: 3.x
>
>
> Building on what is suggested by: CASSANDRA-8488
> It would be great if conditional updates could accept a UDF in the IF clause.
> Use Case:
> We are doing real-time in-memory aggregations across many machines. We want
> to update a value (e.g. a dimensional count), but we only want the update
> applied if that time bucket has not already been incorporated by another
> machine. (protecting against partitioning, replays, etc.)
> In this case, we want something like:
> UPDATE value=v, slices+="1123213222-30" IF not_contains(slices,
> 1123213222-30)
> Where "slices" is a column that contains all time slices, and 112313222-30
> represents a slice of time (start time, plus interval).
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