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

["Florian Jetter (JIRA)" <ji...@apache.org>]

Florian Jetter created ARROW-5085:
-------------------------------------

             Summary: [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
            Reporter: Florian Jetter


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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