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https://issues.apache.org/jira/browse/ARROW-5085?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney resolved ARROW-5085.
---------------------------------
Resolution: Fixed
Fix Version/s: 0.15.0
Issue resolved by pull request 5107
[https://github.com/apache/arrow/pull/5107]
> [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, pull-request-available
> Fix For: 0.15.0
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> 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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