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https://issues.apache.org/jira/browse/BEAM-9379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17189358#comment-17189358
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Robin Qiu commented on BEAM-9379:
---------------------------------

Hi Niels, the reason is because Calcite is a *vendored* dependency of Beam. 
Beam vendors some of its dependencies to avoid downstream users hitting 
dependency conflicts, so we cannot simply drop the vendoring. See this thread 
for more discussion on vendoring: 
https://lists.apache.org/thread.html/4c12db35b40a6d56e170cd6fc8bb0ac4c43a99aa3cb7dbae54176815@%3Cdev.beam.apache.org%3E

> Upgrade to Calcite 1.25.0
> -------------------------
>
>                 Key: BEAM-9379
>                 URL: https://issues.apache.org/jira/browse/BEAM-9379
>             Project: Beam
>          Issue Type: Task
>          Components: dsl-sql
>            Reporter: Rui Wang
>            Assignee: Robin Qiu
>            Priority: P2
>          Time Spent: 2h
>  Remaining Estimate: 0h
>
> Upgrade to Calcite 1.22.0 after it gets released (expected by end of Feb 
> 2020).



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