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Posted to dev@arrow.apache.org by "Simon Watts (Jira)" <ji...@apache.org> on 2020/05/19 19:54:00 UTC

[jira] [Created] (ARROW-8862) NumericBuilder does not use MemoryPool passed to CTOR

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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