[jira] [Updated] (ARROW-1993) [Python] Add function for determining implied Arrow schema from pandas.DataFrame

["Wes McKinney (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-1993?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wes McKinney updated ARROW-1993:
--------------------------------
    Fix Version/s:     (was: 0.11.0)
                   0.12.0

> [Python] Add function for determining implied Arrow schema from pandas.DataFrame
> --------------------------------------------------------------------------------
>
>                 Key: ARROW-1993
>                 URL: https://issues.apache.org/jira/browse/ARROW-1993
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Python
>            Reporter: Wes McKinney
>            Assignee: Uwe L. Korn
>            Priority: Major
>              Labels: beginner, pull-request-available
>             Fix For: 0.12.0
>
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> Currently the only option is to use {{Table/Array.from_pandas}} which does significant unnecessary work and allocates memory. If only the schema is of interest, then we could do less work and not allocate memory.
> We should provide the user a function {{pyarrow.Schema.from_pandas}} which takes a DataFrame as an input and returns the respective Arrow schema. The functionality for determing the schema is already available in the Python code, it is at moment just very tightly bound to the conversion infrastructure.



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