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https://issues.apache.org/jira/browse/CALCITE-1227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15350458#comment-15350458
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Julian Hyde commented on CALCITE-1227:
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I took [~zhenw]'s work in https://github.com/apache/calcite/pull/239, fixed up,
and added cancel functionality. I strongly believe that cancel flag should be
allocated at execute time, not prepare time, so I changed the code accordingly.
I also added a test for cancel, and tried to reduce the duplication between
CsvEnumerator and CsvStreamEnumerator. (It overlaps work going on in
CALCITE-884, unfortunately.)
[~zhenw], Can you please review
https://github.com/julianhyde/calcite/tree/1227-streaming-csv-table?
> 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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