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https://issues.apache.org/jira/browse/ARROW-640?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16398355#comment-16398355
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Antoine Pitrou commented on ARROW-640:
--------------------------------------
I don't think we're concerned about particular workloads for now. Something
like {{%timeit hash\(x)}} (in IPython syntax) is a good micro-benchmark for
this.
Integer is the main type that I think might be use in a hashing context so you
may want to write a native hash implementation for them, while letting other
types defer to {{as_py}}.
Also in some cases (such as StructValue), the {{as_py}} fallback won't work. We
may or may not care about this immediately (i.e. if you only want to implement
numbers, we can open an issue for the other types).
> [Python] Arrow scalar values should have a sensible __hash__ and comparison
> ---------------------------------------------------------------------------
>
> Key: ARROW-640
> URL: https://issues.apache.org/jira/browse/ARROW-640
> Project: Apache Arrow
> Issue Type: Bug
> Components: Python
> Reporter: Miki Tebeka
> Assignee: Alex Hagerman
> Priority: Major
> Fix For: 0.10.0
>
>
> {noformat}
> In [86]: arr = pa.from_pylist([1, 1, 1, 2])
> In [87]: set(arr)
> Out[87]: {1, 2, 1, 1}
> In [88]: arr[0] == arr[1]
> Out[88]: False
> In [89]: arr
> Out[89]:
> <pyarrow.array.Int64Array object at 0x7f8c8c739e08>
> [
> 1,
> 1,
> 1,
> 2
> ]
> {noformat}
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