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Posted to dev@arrow.apache.org by "Raphael Taylor-Davies (Jira)" <ji...@apache.org> on 2020/04/30 22:19:00 UTC

[jira] [Created] (ARROW-8659) ListBuilder and FixedSizeListBuilder capacity

Raphael Taylor-Davies created ARROW-8659:
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             Summary: ListBuilder and FixedSizeListBuilder capacity
                 Key: ARROW-8659
                 URL: https://issues.apache.org/jira/browse/ARROW-8659
             Project: Apache Arrow
          Issue Type: Improvement
            Reporter: Raphael Taylor-Davies
            Assignee: Raphael Taylor-Davies


Both ListBuilder and FixedSizeListBuilder accept a values_builder as a constructor argument and then set the capacity of their internal builders based off the length of this values_builder. Unfortunately at construction time this values_builder is normally empty, and consequently programs spend an unnecessary amount of time reallocating memory.

 

This should be addressed by adding new constructor methods that allow specifying the desired capacity upfront.

 

 



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