[jira] [Created] (ARROW-11929) [C++][Compute] Promote Expression to the compute namespace

[Ben Kietzman (Jira)]

Ben Kietzman created ARROW-11929:
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             Summary: [C++][Compute] Promote Expression to the compute namespace
                 Key: ARROW-11929
                 URL: https://issues.apache.org/jira/browse/ARROW-11929
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
    Affects Versions: 3.0.0
            Reporter: Ben Kietzman
            Assignee: Ben Kietzman


See discussion in 
https://docs.google.com/document/d/1AyTdLU-RxA-Gsb9EsYnrQrmqPMOYMfPlWwxRi1Is1tQ

This will be necessary for ARROW-11928 since some ExecNodes will be constructed 
with one or more Expressions. For example FilterNodes will evaluate an 
Expression against their input batches to produce selection vectors.



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