tustvold commented on pull request #1180:
URL: https://github.com/apache/arrow-rs/pull/1180#issuecomment-1018518863
Added some benchmarks
```
arrow_array_reader/read StringDictionary, dictionary encoded, mandatory, no
NULLs - old
time: [1.2224 ms 1.2231 ms 1.2238 ms]
arrow_array_reader/read StringDictionary, dictionary encoded, mandatory, no
NULLs - new
time: [20.440 us 20.464 us 20.490 us]
arrow_array_reader/read StringDictionary, dictionary encoded, optional, no
NULLs - old
time: [1.2893 ms 1.2898 ms 1.2902 ms]
arrow_array_reader/read StringDictionary, dictionary encoded, optional, no
NULLs - new
time: [30.914 us 30.923 us 30.933 us]
arrow_array_reader/read StringDictionary, dictionary encoded, optional, half
NULLs - old
time: [1.1340 ms 1.1344 ms 1.1347 ms]
arrow_array_reader/read StringDictionary, dictionary encoded, optional, half
NULLs - new
time: [38.225 us 38.234 us 38.243 us]
```
So a nice 60x performance improvement :smile:
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