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https://issues.apache.org/jira/browse/CALCITE-4125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17161127#comment-17161127
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Viliam Durina commented on CALCITE-4125:
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Which model are you following? Is it the TVR (Time-Varying Relation) model,
described [here|https://arxiv.org/abs/1905.12133]? Then, conceptually, there's
no such thing as a _stream_, let alone a _HOP stream_. HOP transforms a
relation into another relation, and then you join two relations.
> Stream Join
> -----------
>
> Key: CALCITE-4125
> URL: https://issues.apache.org/jira/browse/CALCITE-4125
> Project: Calcite
> Issue Type: Sub-task
> Reporter: Rui Wang
> Priority: Major
>
> Right now stream JOIN is supported in syntax (e.g. in planner), however,
> there are more areas needs a enhancement:
> 1. Does windowing strategy in JOIN have a constraint? For example, is a
> TUMBLE stream allowed to join a HOP stream?
> 2. If there is any constraints on windowing strategy in JOIN, how will that
> affect JOIN reordering?
> 3. How to optimize stream join stream or stream join table, which, by nature,
> should be different from table join table?
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