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https://issues.apache.org/jira/browse/FLINK-6250?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15955041#comment-15955041
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Stefano Bortoli commented on FLINK-6250:
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I will approach this implementing a processing function starting from the the
simple aggregation:
1 - add a "distinctValue" MapState counting aggregated unique values in the
window,
2 - aggregating when the value is previously unseen
3 - decreasing counter when the value goes out of boundaries
4 - retract aggregator & remove from state when the counter is set to zero.
> Distinct procTime with Rows boundaries
> --------------------------------------
>
> Key: FLINK-6250
> URL: https://issues.apache.org/jira/browse/FLINK-6250
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: radu
> Assignee: Stefano Bortoli
>
> Support proctime with rows boundaries
> Q1.1. `SELECT SUM( DISTINCT b) OVER (ORDER BY procTime() ROWS BETWEEN 2
> PRECEDING AND CURRENT ROW) FROM stream1`
> Q1.1. `SELECT COUNT(b), SUM( DISTINCT b) OVER (ORDER BY procTime() ROWS
> BETWEEN 2 PRECEDING AND CURRENT ROW) FROM stream1`
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