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https://issues.apache.org/jira/browse/ARROW-3002?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Krisztian Szucs reassigned ARROW-3002:
--------------------------------------
Assignee: Krisztian Szucs
> [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
> Time Spent: 0.5h
> 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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