tustvold opened a new pull request, #4861:
URL: https://github.com/apache/arrow-rs/pull/4861
# Which issue does this PR close?
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Closes #.
# Rationale for this change
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Encoding numerics directly in the tape drastically improves the performance
of the serde integration.
```
small_i32 time: [5.3992 µs 5.4006 µs 5.4020 µs]
change: [-70.553% -70.532% -70.511%] (p = 0.00 <
0.05)
Performance has improved.
large_i32 time: [5.2606 µs 5.2618 µs 5.2631 µs]
change: [-76.768% -76.747% -76.727%] (p = 0.00 <
0.05)
Performance has improved.
Found 2 outliers among 100 measurements (2.00%)
2 (2.00%) high mild
small_i64 time: [5.2937 µs 5.2960 µs 5.2986 µs]
change: [-73.032% -73.002% -72.974%] (p = 0.00 <
0.05)
Performance has improved.
medium_i64 time: [5.3314 µs 5.3372 µs 5.3417 µs]
change: [-77.574% -77.553% -77.533%] (p = 0.00 <
0.05)
Performance has improved.
Found 2 outliers among 100 measurements (2.00%)
1 (1.00%) low severe
1 (1.00%) low mild
large_i64 time: [5.6473 µs 5.6503 µs 5.6532 µs]
change: [-81.152% -81.103% -81.056%] (p = 0.00 <
0.05)
Performance has improved.
Found 22 outliers among 100 measurements (22.00%)
22 (22.00%) low severe
small_f32 time: [3.6082 µs 3.6101 µs 3.6121 µs]
change: [-93.595% -93.591% -93.588%] (p = 0.00 <
0.05)
Performance has improved.
large_f32 time: [3.5233 µs 3.5245 µs 3.5256 µs]
change: [-94.058% -94.055% -94.053%] (p = 0.00 <
0.05)
Performance has improved.
```
It additionally opens the door to eager parsing in the future, which may
yield performance improvements for regular JSON decoding.
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