[jira] [Created] (ARROW-12530) [C++] Remove Buffer::mutable_data_ member and use const_cast on data_ only if is_mutable_ is true

[Wes McKinney (Jira)]

Wes McKinney created ARROW-12530:
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             Summary: [C++] Remove Buffer::mutable_data_ member and use 
const_cast on data_ only if is_mutable_ is true
                 Key: ARROW-12530
                 URL: https://issues.apache.org/jira/browse/ARROW-12530
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Wes McKinney
             Fix For: 5.0.0


Proposed new implementation of mutable_data() by [~apitrou]

{code}
  uint8_t* mutable_data() {
     return is_mutable() ? const_cast<uint8_t*>(data()) : nullptr;
   }
{code}

This will help avoid various classes of bugs (initializing Buffer subclasses 
incorrectly) and make the object smaller on the heap



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