Simon Watts created ARROW-8862:
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Summary: NumericBuilder does not use MemoryPool passed to CTOR
Key: ARROW-8862
URL: https://issues.apache.org/jira/browse/ARROW-8862
Project: Apache Arrow
Issue Type: Bug
Components: C++
Affects Versions: 0.15.0
Reporter: Simon Watts
{{NumericBuilder}} uses the {{pool}} ({{MemoryPool*}}) parameter to initialise
the {{ArrayBuilder}} base class, but does not use it to initialise its own
internal builder, {{data_builder_}} ({{TypedBufferBuilder}}). For comparison
{{ArrayBuilder}} uses the {{pool}} to initialise its own
{{null_bitmap_builder_}} member (also a {{TypedBufferBuilder}}).
Found in version 0.15.0, present in current head.
This effect was observed when trying to switch to a custom {{MemoryPool}} for
performance reasons. A hook was used to detect any use of the {{MemoryPool}}
proved by {{default_memory_pool()}}.
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