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https://issues.apache.org/jira/browse/PARQUET-1047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16068605#comment-16068605
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yugu commented on PARQUET-1047:
-------------------------------
So in our case we were trying to preserve only the header information of the
data ('cause we have a read_meta function) in case the data is empty.
Either way, seems the function is not particularly required by majority...
I've wrote a work around and put in one row of null values when the data table
is empty..
> Anyway to write empty row group?
> --------------------------------
>
> Key: PARQUET-1047
> URL: https://issues.apache.org/jira/browse/PARQUET-1047
> Project: Parquet
> Issue Type: Bug
> Components: parquet-cpp
> Affects Versions: cpp-1.1.0
> Reporter: yugu
>
> [Error]
> So I'm trying to write only header information (column names and such).
> {code:java}
> parquet::RowGroupWriter* rg_writer =
> file_writer->AppendRowGroup(0);
> for (i = 0; i < Cols; i++){
> parquet::BoolWriter* writer =
> static_cast<parquet::BoolWriter*>(rg_writer->NextColumn());
> writer->WriteBatch(0, nullptr, nullptr, nullptr);
> }
> {code}
> The problem is that when trying to close the file_writer, the program throws:
> {code:java}
> Parquet what error: Parquet Write error: Column 3 is not complete.
> {code}
> [Possbility]
> I know this is possible because as per [this
> post|https://issues.apache.org/jira/browse/PARQUET-104?jql=project%20%3D%20PARQUET%20AND%20text%20~%20%22empty%22]
> an empty row group was written to the back.
> Tho the problem was present in parquet-mr instead of parquet-cpp, I guess
> it's fair to expect some feature like that.
> Or maybe I don't fully understand how the system works.... would be great if
> you guys can point out where to look it : D
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