tustvold opened a new pull request, #2319:
URL: https://github.com/apache/arrow-rs/pull/2319
# Which issue does this PR close?
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Part of #2282
# Rationale for this change
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Following #2278 we can efficiently decode blocks of 64x 64-bit integers,
however, the defaults of DeltaBitPackEncoder configure 32-wide miniblocks.
#2282 tracks allowing users to configure this, but in the short term we should
choose a more optimal default.
```
arrow_array_reader/Int64Array/binary packed, mandatory, no NULLs
time: [25.295 us 25.307 us 25.322 us]
change: [-59.630% -59.504% -59.394%] (p = 0.00 <
0.05)
Performance has improved.
Found 8 outliers among 100 measurements (8.00%)
5 (5.00%) high mild
3 (3.00%) high severe
arrow_array_reader/Int64Array/binary packed, optional, no NULLs
time: [41.864 us 41.871 us 41.878 us]
change: [-47.152% -47.076% -46.954%] (p = 0.00 <
0.05)
Performance has improved.
Found 9 outliers among 100 measurements (9.00%)
2 (2.00%) low mild
3 (3.00%) high mild
4 (4.00%) high severe
arrow_array_reader/Int64Array/binary packed, optional, half NULLs
time: [46.301 us 46.324 us 46.345 us]
change: [-26.069% -25.818% -25.590%] (p = 0.00 <
0.05)
Performance has improved.
Found 2 outliers among 100 measurements (2.00%)
1 (1.00%) high mild
```
# What changes are included in this PR?
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Changes to using a miniblock size of 64 for 64-bit integers
# Are there any user-facing changes?
There should be no breaking user-facing changes, although this may change
the way their data is encoded.
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