[ 
https://issues.apache.org/jira/browse/ARROW-11463?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17277647#comment-17277647
 ] 

Tao He commented on ARROW-11463:
--------------------------------

Thanks for the background of pickle 5 [~lausen] .

[~lausen] for your case, rather than invoking `pa.serialize`, you could create 
a stream using `pa.ipc.new_stream` and feed a IpcWriteOption, then use 
`.write_table()` to write you tables to the stream.

 

c.f.:

+ 
[https://arrow.apache.org/docs/python/generated/pyarrow.ipc.new_stream.html#pyarrow.ipc.new_stream]

+ 
[https://arrow.apache.org/docs/python/generated/pyarrow.RecordBatchStreamWriter.html#pyarrow.RecordBatchStreamWriter.write_table]

 

Hope that could be helpful for you!

> Allow configuration of IpcWriterOptions 64Bit from PyArrow
> ----------------------------------------------------------
>
>                 Key: ARROW-11463
>                 URL: https://issues.apache.org/jira/browse/ARROW-11463
>             Project: Apache Arrow
>          Issue Type: Task
>          Components: Python
>            Reporter: Leonard Lausen
>            Assignee: Tao He
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 4.0.0
>
>          Time Spent: 1h
>  Remaining Estimate: 0h
>
> For tables with many chunks (2M+ rows, 20k+ chunks), `pyarrow.Table.take` 
> will be around 1000x slower compared to the `pyarrow.Table.take` on the table 
> with combined chunks (1 chunk). Unfortunately, if such table contains large 
> list data type, it's easy for the flattened table to contain more than 2**31 
> rows and serialization of the table with combined chunks (eg for Plasma 
> store) will fail due to `pyarrow.lib.ArrowCapacityError: Cannot write arrays 
> larger than 2^31 - 1 in length`
> I couldn't find a way to enable 64bit support for the serialization as called 
> from Python (IpcWriteOptions in Python does not expose the CIpcWriteOptions 
> 64 bit setting; further the Python serialization APIs do not allow 
> specification of IpcWriteOptions)
> I was able to serialize successfully after changing the default and rebuilding
> {code:c++}
> modified   cpp/src/arrow/ipc/options.h
> @@ -42,7 +42,7 @@ struct ARROW_EXPORT IpcWriteOptions {
>    /// \brief If true, allow field lengths that don't fit in a signed 32-bit 
> int.
>    ///
>    /// Some implementations may not be able to parse streams created with 
> this option.
> -  bool allow_64bit = false;
> +  bool allow_64bit = true;
>  
>    /// \brief The maximum permitted schema nesting depth.
>    int max_recursion_depth = kMaxNestingDepth;
> {code}



--
This message was sent by Atlassian Jira
(v8.3.4#803005)

Reply via email to