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Posted to dev@arrow.apache.org by "Wes McKinney (JIRA)" <ji...@apache.org> on 2018/12/21 00:38:00 UTC
[jira] [Created] (ARROW-4095) [C++] Implement optimizations for
dictionary unification where dictionaries are prefixes of the unified
dictionary
Wes McKinney created ARROW-4095:
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Summary: [C++] Implement optimizations for dictionary unification where dictionaries are prefixes of the unified dictionary
Key: ARROW-4095
URL: https://issues.apache.org/jira/browse/ARROW-4095
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Wes McKinney
Fix For: 0.13.0
In the event that the unified dictionary contains other dictionaries as prefixes (e.g. as the result of delta dictionaries), we can avoid memory allocation and index transposition.
See discussion at
https://github.com/apache/arrow/pull/3165#discussion_r243020982
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