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[jira] [Created] (ARROW-3523) [JS] Assign dictionary IDs in IPC writer rather than on creation


Brian Hulette created ARROW-3523:
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             Summary: [JS] Assign dictionary IDs in IPC writer rather than on creation
                 Key: ARROW-3523
                 URL: https://issues.apache.org/jira/browse/ARROW-3523
             Project: Apache Arrow
          Issue Type: Improvement
            Reporter: Brian Hulette
             Fix For: JS-0.5.0


 Currently the JS implementation relies on on the user assigning IDs for dictionaries that they create, we should do something like the C++ implementation, which uses a dictionary id memo to assign and retrieve dictionary ids in the IPC writer (https://github.com/apache/arrow/blob/master/cpp/src/arrow/ipc/metadata-internal.cc#L495).



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