[jira] [Resolved] (ARROW-3002) [Python] Implement better DataType hash function

["Antoine Pitrou (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-3002?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Antoine Pitrou resolved ARROW-3002.
-----------------------------------
       Resolution: Fixed
    Fix Version/s: 0.11.0

Issue resolved by pull request 2385
[https://github.com/apache/arrow/pull/2385]

> [Python] Implement better DataType hash function
> ------------------------------------------------
>
>                 Key: ARROW-3002
>                 URL: https://issues.apache.org/jira/browse/ARROW-3002
>             Project: Apache Arrow
>          Issue Type: Wish
>            Reporter: Sam Oluwalana
>            Assignee: Krisztian Szucs
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 0.11.0
>
>          Time Spent: 5h 20m
>  Remaining Estimate: 0h
>
> {code:python}
> >>> x = pa.field('record', pa.struct([pa.field('x', pa.int32(), nullable=False)]))
> >>> y = pa.field('record', pa.struct([pa.field('x', pa.int32(), nullable=True)]))
> >>> z = pa.field('record', pa.struct([pa.field('x', pa.int32(), nullable=True)]))
> >>> x.__hash__()
> -9223372036569171727
> >>> y.__hash__()
> 285604054
> >>> z.__hash__()
> 285604076
> >>> x.type
> StructType(struct<x: int32>)
> >>> x.type.__hash__()
> 429437081997812647
> >>> y.type.__hash__()
> 429437081997812647
> >>> x
> pyarrow.Field<record: struct<x: int32>>
> >>> y
> pyarrow.Field<record: struct<x: int32>>
> {code}
> Expected: 
> y.__hash__() should be the same as z.__hash__()
> x.type.__hash__() should be different than y.type.__hash__()



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