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tianchenMicah Kornfield
a0ee6377ce5
tianchen authored and Micah Kornfield committed 3b79a207f7c
ARROW-5909: [Java] Optimize ByteFunctionHelpers equals & compare logic

Related to [ARROW-5909](https://issues.apache.org/jira/browse/ARROW-5909).
Now it first compare Long values and then if length < 8 then it compares Byte values.
Add the logic to compare Int values when 4 < length < 8.

Buffer length far greater than 8 have similar performance in equals,  in case buffer length < 8 performances are as below:

ByteFunctionHelpersBenchmarks#equals
Before: avgt    5  7.718 ± 0.401  ns/op
After:    avgt    5  5.005 ± 0.830  ns/op

Author: tianchen <niki.lj@alibaba-inc.com>

Closes #4852 from tianchen92/ARROW-5909 and squashes the following commits:

18db45fd3 <tianchen> add more UT
dbd092365 <tianchen> remove reverse in ByteFunctionHelpers
41030c4e9 <tianchen> fix
e6ab2ed1d <tianchen> ARROW-5909:  Optimize ByteFunctionHelpers equals & compare logic