[jira] [Created] (IGNITE-20078) Sql. Improve (or remove) CancellationException handling.

["Pavel Pereslegin (Jira)" <ji...@apache.org>]

Pavel Pereslegin created IGNITE-20078:
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             Summary: Sql. Improve (or remove) CancellationException handling.
                 Key: IGNITE-20078
                 URL: https://issues.apache.org/jira/browse/IGNITE-20078
             Project: Ignite
          Issue Type: Improvement
          Components: sql
            Reporter: Pavel Pereslegin


At the moment, users are allowed to cancel queries using Session#close* methods.

But we also partially implemented the logic to allow users to cancel queries using the {{CompletableFuture#cancel}} method.

For example, internal {{SqlQueryProcessor#querySingleAsync}} returns a future, which allows the queryCancel handler to be called, which releases the resources associated with the query.
But the public method {{Session#executeAsync}} returns a child future, canceling which, at the moment, will not release the resources.

At the same time, the implementation of the public method {{Session#executeBatchAsync}} handles {{CancellationException}} and can cancel batch tasks, but currently incorrectly cancels the future returned from {{querySingleAsync}}.

We need to fix the {{CancellationException}} handling logic or clean up our code of these complexities if we don't want to allow users to cancel requests using such approach.



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