[jira] [Created] (ARROW-8752) Remove unused hashmap

[QP Hou (Jira)]

QP Hou created ARROW-8752:
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             Summary: Remove unused hashmap 
                 Key: ARROW-8752
                 URL: https://issues.apache.org/jira/browse/ARROW-8752
             Project: Apache Arrow
          Issue Type: Improvement
            Reporter: QP Hou
            Assignee: QP Hou


both base_nodes and base_nodes_set doesn't seem to be used at all in 
build_array_reader.



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