Weston Pace created ARROW-16177:
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Summary: [C++] Replace ThreadIndexer with a more performant
thread-local implementation
Key: ARROW-16177
URL: https://issues.apache.org/jira/browse/ARROW-16177
Project: Apache Arrow
Issue Type: Bug
Components: C++
Reporter: Weston Pace
Many of the ExecNode operations use thread local state (mostly temporary
buffers) to avoid per-batch allocation. Currently we are using ThreadIndexer
but to get the thread local state requires locking a mutex and a map lookup.
For some of the critical sections we are developing in hash-join this has
become a bottleneck. Ideally we can replace this with something that relies on
thread local state instead of a map shared across all threads.
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