Wes McKinney created ARROW-661:
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Summary: [C++] Add a Flatbuffer metadata type that supports array
data over 2^31 - 1 elements
Key: ARROW-661
URL: https://issues.apache.org/jira/browse/ARROW-661
Project: Apache Arrow
Issue Type: New Feature
Components: C++
Reporter: Wes McKinney
Users of Arrow C++ have reported needing to store large arrays using our shared
memory IPC machinery. While data over 2^31 - 1 elements is "out of spec" as far
as what it means to "implement Arrow", it would be useful to have a
"LargeRecordBatch" type that permits storing large arrays. Other Arrow
implementations in general will not need to support reading and writing this
data -- this is closely related to the tensor discussion in ARROW-550.
{code}
struct LargeFieldNode {
length: long;
null_count: long;
}
table LargeRecordBatch {
length: long;
nodes: [LargeFieldNode];
buffers: [Buffer];
}
{code}
An initial implementation of this will be marked experimental so that we can
get the code into the hands of users (like the Ray project
https://github.com/ray-project/ray) in case there's some ongoing discussion to
be had about handling very large vectors/arrays.
Reading and writing this metadata should be achievable without a huge amount of
code duplication, I will see what I can do.
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