[C++] ensure C++ implementation meets clarified dictionary spec

[asfimport]

see parent issue.

 

CC @tianchen92

Reporter: Micah Kornfield / @emkornfield
Assignee: Liya Fan / @liyafan82

Related issues:

• [C++] Support reading delta dictionaries in IPC streams (supercedes)

PRs and other links:

• GitHub Pull Request #7544

_{Note: This issue was originally created as ARROW-7285. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
This won't be completed in 0.17.0

[asfimport]

Liya Fan / @liyafan82:
[~emkornfield@gmail.com] If nobody else is working on this issue, may I try to provide a patch for it?

[asfimport]

Micah Kornfield / @emkornfield:
I'm not at the moment.  @wesm anybody on your side?

[asfimport]

Antoine Pitrou / @pitrou:
Issue resolved by pull request 7544
#7544