[C++] Implement kernel function that converts a dense array to dictionary given known dictionary

[asfimport]

This may simply be a special case of cast using a dictionary type

Reporter: Wes McKinney / @wesm

Related issues:

• [C++] C++ array kernels framework and execution buildout (umbrella issue) (is a child of)
• [C++][Python] Allow to specify a dictionary type for dictionary_encode() function (relates to)
• [C++] Add function to "conform" a dictionary array to a target new dictionary (is related to)

_{Note: This issue was originally created as ARROW-1574. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
Values not found in the dictionary become null

[asfimport]

Antoine Pitrou / @pitrou:
@fsaintjacques

[asfimport]

Wes McKinney / @wesm:
This would be a useful expansion of the functions in vector_hash.cc. We must introduce a HashOptions to be able to supply the known dictionary when invoking the functions

[asfimport]

Antoine Pitrou / @pitrou:
@edponce

[asfimport]

Antoine Pitrou / @pitrou:
cc @nirandaperera

[github-actions]

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