Weston Pace created ARROW-17239:
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Summary: [C++] Calculate output type from aggregate to convert
arrow aggregate to substrait
Key: ARROW-17239
URL: https://issues.apache.org/jira/browse/ARROW-17239
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Weston Pace
Fix For: 10.0.0
I am adding support for mapping to/from Arrow aggregates and Substrait
aggregates in ARROW-15582. However, the Arrow-Substrait direction is currently
blocked because the Substrait plan needs to know the output type of an
aggregate and there is no easy way to determine that from the Arrow information
we have.
We should be able to get this information from the function registry but the
conversion routines do not have access to the function registry that I can
tell. I'm not sure if the best solution is to pass the function registry into
ToProto or to add the output type to the aggregate in Arrow.
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