Wes McKinney created ARROW-8623:
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Summary: [C++][Gandiva] Reduce use of Boost, remove Boost headers
from header files
Key: ARROW-8623
URL: https://issues.apache.org/jira/browse/ARROW-8623
Project: Apache Arrow
Issue Type: Improvement
Components: C++, C++ - Gandiva
Reporter: Wes McKinney
Fix For: 1.0.0
Boost is currently a transitive dependency of many of Gandiva's public header
files. I suggest the following:
* Do not include Boost transitively in any installed header file
* Reduce usages of Boost altogether
On the latter point, most usages of Boost can be trimmed by having a
{{hash_combine}} function inside the Arrow codebase. See results of grepping
the codebase
https://gist.github.com/wesm/190006d91628e6bf7c04deb596a52cff
It seems that Boost cannot be easily eliminated altogether at the present
moment because of a use of Boost.Multiprecision ({{int256_t}}). At some point
someone may want to implement sufficient 256-bit integer functions so that we
don't have to depend on Boost.Multiprecision
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