[jira] [Created] (ARROW-3740) [C++] Calling ArrayBuilder::Resize with length smaller than current appended length results in invalid state

[Wes McKinney (JIRA)]

Wes McKinney created ARROW-3740:
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             Summary: [C++] Calling ArrayBuilder::Resize with length smaller 
than current appended length results in invalid state
                 Key: ARROW-3740
                 URL: https://issues.apache.org/jira/browse/ARROW-3740
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++
    Affects Versions: 0.11.1
            Reporter: Wes McKinney
             Fix For: 0.12.0


This was brought up by the Go patch ARROW-3613. If you append some data to a 
builder, then call {{Resize}} with something smaller than what's reported by 
{{length()}}, the capacity will be updated, but the length will not. So I think 
further appends would probably segfault. Either way we should add some tests 
for this case of "shrinking" a builder (which destroys data, but it's permitted 
by the API 



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