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https://issues.apache.org/jira/browse/CALCITE-6372?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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EveyWu updated CALCITE-6372:
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Attachment: image-2024-07-31-23-42-31-044.png
> Support ASOF joins
> ------------------
>
> Key: CALCITE-6372
> URL: https://issues.apache.org/jira/browse/CALCITE-6372
> Project: Calcite
> Issue Type: New Feature
> Components: core
> Affects Versions: 1.36.0
> Reporter: Mihai Budiu
> Assignee: Mihai Budiu
> Priority: Minor
> Labels: pull-request-available
>
> Seems that this new kind of JOIN named AS OF is very useful for processing
> time-series data. Here is some example documentation from Snowflake:
> https://docs.snowflake.com/en/sql-reference/constructs/asof-join
> The semantics is similar to a traditional join, but the result always
> contains at most one record from the left side, with the last​ matching
> record on the right side (where "time" is any value that can be compared for
> inequality). This can be expressed in SQL, but it looks very cumbersome,
> using a JOIN, a GROUP BY, and then an aggregation to keep the last value.
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