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From "Tham (JIRA)" <>
Subject [jira] [Commented] (PARQUET-1022) [C++] Append mode in parquet-cpp
Date Fri, 15 Mar 2019 10:44:00 GMT


Tham commented on PARQUET-1022:

Uhm, after looking into C++ API, I think it requires a lot of work to either concat multiple
files by binary blocks as [~xhochy] suggested or write data and metadata separately as [~wesmckinn]
suggested. It seems that current implementation is not designed for this purpose and seems
tricky to do so. 

I also saw that the commit of merge-tool in Java has recently been reverted []

Correct me if I'm wrong. Any idea is welcome.

> [C++] Append mode in parquet-cpp
> --------------------------------
>                 Key: PARQUET-1022
>                 URL:
>             Project: Parquet
>          Issue Type: New Feature
>          Components: parquet-cpp
>    Affects Versions: cpp-1.1.0
>            Reporter: yugu
>            Assignee: Wes McKinney
>            Priority: Major
> As said, currently trying to work out a append feature for parquet files in c++.
> (been searching through repo etc, can't find example tho..)
> Current solution is to (assume no schema changes that is):
> Read in metadata
> Change metadata based on appended rows+ original rows
> Append a new row group (or multiple row group writer)
> Write the new rows.
> ---
> The problem is that, is approached this way, the original last row group may not be complete
filled. Was wondering if there is a fix or I'm using the api wrong...
> Thanks ! : D

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