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Posted to issues@arrow.apache.org by "Wes McKinney (JIRA)" <ji...@apache.org> on 2017/08/20 16:52:00 UTC
[jira] [Commented] (ARROW-229) [C++] Implement safe casts for
primitive types
[ https://issues.apache.org/jira/browse/ARROW-229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16134502#comment-16134502 ]
Wes McKinney commented on ARROW-229:
------------------------------------
Repurposed this JIRA and expanded scope somewhat. We need to create a module of safe casts (i.e. between integer types, or integers and floats). We can also add an option to perform unsafe cast without warnings / errors (the equivalent of using {{static_cast<T>}}). We need this for some other features in the queue
> [C++] Implement safe casts for primitive types
> ----------------------------------------------
>
> Key: ARROW-229
> URL: https://issues.apache.org/jira/browse/ARROW-229
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Uwe L. Korn
> Fix For: 0.7.0
>
>
> In some situations, you want to cast the data in a PrimitiveArray to a different (but similar) data type, e.g. from {{uint32_t}} to {{int32_t}} or {{uint32_t}} to {{uint8_t}}. This can either be done by reinterpreting the data or needs to involve a copy if the size of the underlying type changes. There is already an implementation for this in {{parquet-cpp}} that could be pulled out into Arrow: https://github.com/apache/parquet-cpp/blob/9a0407e684c0a6299d0e6ab98c11c1162915c0ee/src/parquet/arrow/writer.cc#L71
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