Julian Hyde created CALCITE-1227:
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Summary: 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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