[C++] Improve float parsing performance #19655
Description
According to the number-parsing-benchmark, parsing integers from strings currently runs at around ~1.6M items/sec. (on Ubuntu 18.04). We should be able to do better. This will be important for CSV parsing performance.
Reporter: Antoine Pitrou / @pitrou
Assignee: Antoine Pitrou / @pitrou
PRs and other links:
Note: This issue was originally created as ARROW-3320. Please see the migration documentation for further details.