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From "Wes McKinney (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PARQUET-1022) [C++] Append mode in parquet-cpp
Date Tue, 12 Mar 2019 14:25:00 GMT

    [ https://issues.apache.org/jira/browse/PARQUET-1022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16790596#comment-16790596
] 

Wes McKinney commented on PARQUET-1022:
---------------------------------------

I think theoretically you can write row groups to disk separate from metadata. Not sure if
there are many systems out there that implement this

> [C++] Append mode in parquet-cpp
> --------------------------------
>
>                 Key: PARQUET-1022
>                 URL: https://issues.apache.org/jira/browse/PARQUET-1022
>             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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