Fix zombie $partitions queries left running by SQLAlchemy reflection - #627
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LGTM, except for one minor comment re the docstring of an aux function used only in tests
_get_partitions never closes the query result after reading cursor.description, so the underlying query is never cancelled and lingers on the coordinator until it eventually times out on its own. Close the result in a finally block so it's always cancelled, whether or not reading cursor.description succeeds. Co-authored-by: viniolivieri <vinicius.olivieri@jampp.com>
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Description
_get_partitions never closes the query result after reading cursor.description, so the underlying query is never cancelled and lingers on the coordinator until it eventually times out on its own. Close the result in a finally block so it's always cancelled, whether or not reading cursor.description succeeds.
Non-technical explanation
Supersedes #608
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