Weston Pace created ARROW-16178:
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Summary: [C++] Add a ThreadLocalState concept built on thread local
Key: ARROW-16178
URL: https://issues.apache.org/jira/browse/ARROW-16178
Project: Apache Arrow
Issue Type: Sub-task
Components: C++
Reporter: Weston Pace
The ThreadLocalState is tied to an executor and, on creation, creates a state
for every thread in the executor. In order to quickly access a particular
thread's state we need a way to get a thread index (the index of the thread in
the executor). Historically we used ThreadIndexer and this JIRA introduces a
new approach using thread local.
Similar to the ThreadIndexer this thread local state concept will fail when the
capacity is resized during a run.
Similar to the ThreadIndexer this concept won't work too well for serial
execution until ARROW-15732 is resolved.
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