Fix python segfault in multi-threaded execution #2283
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Fixes a potential Python segfault introduced in
2.3.0, which can occur when:Table()is constructed via Arrow input and ...Table.update()is called with anArrowby a separate thread before the previous call has resolved.See the included test for a repro, which implements a multi-threaded executor then queues 20 read/write Arrow operations at once.