pepijnve commented on issue #16193:
URL: https://github.com/apache/datafusion/issues/16193#issuecomment-2916044328
Just for context, I ran into this while working on a Java based application
that drives the DataFusion queries. I want to be able to interrupt query
execution from the Java side. From the Java side I'm basically calling
`runtime.block_on(async { record_batch_stream.next().await })`. Since I can't
use Java's thread interruption mechanism to unblock the `next()` call I was
trying to use `tokio::select!` with a cancellation token instead and that
failed to cancel. This is the same pattern as what the CLI does, just triggered
via a different channel than a signal handler.
I still need to write an experiment for this, but based on my reading of the
documentation even with a `RecordBatchReceiverStream` the aggregate would not
actually get cancelled. The `JoinSet` will get dropped and the spawned tasks
will be aborted, but tokio will only actually be able to abort the loop once
the aggregate's stream yields.
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