Expose query stats through a cursor callback#623
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Add an optional stats_callback to Connection.cursor() that is invoked with a copy of the query stats every time the client processes a response from the coordinator: once right after the query is submitted (so the query id and initial state are available while the query is still running) and again on every subsequent poll. This mirrors the progress monitor exposed by the Trino JDBC driver and lets callers log or monitor a query instead of only being able to inspect it after all rows have been fetched.
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Description
Add an optional stats_callback to Connection.cursor() that is invoked with a copy of the query stats every time the client processes a response from the coordinator: once right after the query is submitted (so the query id and initial state are available while the query is still running) and again on every subsequent poll.
This mirrors the progress monitor exposed by the Trino JDBC driver and lets callers log or monitor a query instead of only being able to inspect it after all rows have been fetched.
Non-technical explanation
Expose query stats through a cursor callback. Fixes #578 .
Release notes
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