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Posted to jira@arrow.apache.org by "David Li (Jira)" <ji...@apache.org> on 2021/05/11 15:14:00 UTC

[jira] [Created] (ARROW-12736) [C++] Eliminate unnecessary copy in FieldPath::Get()

David Li created ARROW-12736:
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             Summary: [C++] Eliminate unnecessary copy in FieldPath::Get()
                 Key: ARROW-12736
                 URL: https://issues.apache.org/jira/browse/ARROW-12736
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: David Li
            Assignee: David Li
             Fix For: 5.0.0


FieldPath::Get() uses RecordBatch::column_data which returns a vector<shared_ptr<>> by _value_ instead of by _reference_ - so with wide schemas, we end up copying and then destroying a lot of shared_ptrs. When done in a tight loop - as with dataset projection - this is a major performance pessimization.



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