[C++] Reduce generated code in compute/kernels/scalar_compare.cc

[asfimport]

We are instantiating multiple versions of templates in this module for cases that, byte-wise, do the exact same comparison. For example:

• For equals, not_equals, we can use the same 32-bit/64-bit comparison kernels for signed int / unsigned int / floating point types of the same byte width

• TimestampType can reuse int64 kernels, similarly for other date/time types

• BinaryType/StringType can share kernels

  etc.

Reporter: Wes McKinney / @wesm
Assignee: Wes McKinney / @wesm

Related issues:

• [C++] C++ array kernels framework and execution buildout (umbrella issue) (is a child of)
• [C++] Reduce shared library / binary code size (umbrella issue) (is related to)

PRs and other links:

• GitHub Pull Request #7461

_{Note: This issue was originally created as ARROW-8969. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 7461
#7461