[jira] [Assigned] (ARROW-5085) [Python/C++] Conversion of dict encoded null column fails in parquet writing when using RowGroups

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

     [ https://issues.apache.org/jira/browse/ARROW-5085?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wes McKinney reassigned ARROW-5085:
-----------------------------------

    Assignee: Wes McKinney

> [Python/C++] Conversion of dict encoded null column fails in parquet writing when using RowGroups
> -------------------------------------------------------------------------------------------------
>
>                 Key: ARROW-5085
>                 URL: https://issues.apache.org/jira/browse/ARROW-5085
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++
>    Affects Versions: 0.13.0
>            Reporter: Florian Jetter
>            Assignee: Wes McKinney
>            Priority: Minor
>              Labels: parquet
>
> Conversion of dict encoded null column fails in parquet writing when using RowGroups
> {code:python}
> import pyarrow.parquet as pq
> import pandas as pd
> import pyarrow as pa
> df = pd.DataFrame({"col": [None] * 100, "int": [1.0] * 100})
> df = df.astype({"col": "category"})
> table = pa.Table.from_pandas(df)
> buf = pa.BufferOutputStream()
> pq.write_table(
>     table,
>     buf,
>     version="2.0",
>     chunk_size=10,
> )
> {code}
> fails with 
> {{pyarrow.lib.ArrowIOError: Column 2 had 100 while previous column had 10}}



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