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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