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https://issues.apache.org/jira/browse/CALCITE-1227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15311029#comment-15311029
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Julian Hyde commented on CALCITE-1227:
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bq. the `throw unsupported` in the cancel handling suggests `cancel` haven't
been considered thoroughly throughout the execution stage.
Yes, that's true. CALCITE-849 is related to this, but we never fixed it. We're
solving the problem now.
bq. and another issue is that, enumerator read one more record after CTRL+C is
pressed. this might not be desired.
I think that's unavoidable. I don't know any systems that cancel immediately.
It's much more efficient to allow some leeway.
> Add streaming CSV table
> -----------------------
>
> Key: CALCITE-1227
> URL: https://issues.apache.org/jira/browse/CALCITE-1227
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
>
> Add a variant of CsvTable that can be streamed. It would serve as an example
> of how to write stream adapters.
> It would be like the CSV adapter, but watches a file and reports records
> added to the end of the file (like the tail command).
> You’d have to change {{CsvTable}} to implement {{StreamableTable}}, and
> implement the {{Table stream()}} method to return a variant of the table that
> is in “follow” mode.
> It would probably be implemented by a variant of CsvEnumerator, but it is
> getting its input in bursts, as the file is appended to.
> You would still be able to use this adapter to read historical data from the
> CSV file. Appending records to the file would make a nice demo.
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