[jira] [Commented] (ARROW-1276) Cannot serializer empty DataFrame to parquet

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

    [ https://issues.apache.org/jira/browse/ARROW-1276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16101754#comment-16101754 ] 

Wes McKinney commented on ARROW-1276:
-------------------------------------

Perfect, thank you

> Cannot serializer empty DataFrame to parquet
> --------------------------------------------
>
>                 Key: ARROW-1276
>                 URL: https://issues.apache.org/jira/browse/ARROW-1276
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Python
>    Affects Versions: 0.5.0
>            Reporter: Marco Neumann
>            Assignee: Marco Neumann
>            Priority: Minor
>             Fix For: 0.6.0
>
>
> The following code fails with {{pyarrow.lib.ArrowInvalid: Invalid: chunk size per row_group must be greater than 0}} but should not:
> {noformat}
> import pandas as pd
> import pyarrow as pa
> import pyarrow.parquet as pq
> df = pd.DataFrame({'x': pd.Series([], dtype=int)})
> table = pa.Table.from_pandas(df)
> buf = pa.InMemoryOutputStream()
> pq.write_table(table, buf)
> {noformat}
> I have a test and a fix prepared and will upstream both in the upcoming days.



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