Ben Kietzman created ARROW-12873:
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Summary: [C++][Compute] Support tagging ExecBatches with arbitrary
extra information
Key: ARROW-12873
URL: https://issues.apache.org/jira/browse/ARROW-12873
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Ben Kietzman
Ideally, ExecBatches could be tagged with arbitrary optional objects for
tracing purposes and to transmit execution hints from one ExecNode to another.
These should *not* be explicit members like ExecBatch::selection_vector is,
since they may not originate from the arrow library. For an example within the
arrow project: {{libarrow_dataset}} will be used to produce ScanNodes and a
WriteNodes and it's useful to tag scanned batches with their {{Fragment}} of
origin. However adding {{ExecBatch::fragment}} would result in a cyclic
dependency.
To facilitate this tagging capability, we would need a type erased container
something like
{code}
struct AnySet {
void* Get(tag_t tag);
void Set(tag_t tag, void* value, FnOnce<void(void*)> destructor);
};
{code}
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