[C++] Implement basic Filter expression classes

[asfimport]

This will draft the basic classes for creating boolean expressions that are passed to the DataSources/DataFragments for predicate push-down.

Reporter: Francois Saint-Jacques / @fsaintjacques
Assignee: Ben Kietzman / @bkietz

Related issues:

• [C++] Define abstract API for filtering Arrow streams (e.g. predicate evaluation) (is duplicated by)

PRs and other links:

• GitHub Pull Request #5157

_{Note: This issue was originally created as ARROW-6243. Please see the migration documentation for further details.}

[asfimport]

Neal Richardson / @nealrichardson:
Issue resolved by pull request 5157
#5157

[asfimport]

Ji Liu / @tianchen92:
@bkietz @nealrichardson  Hi, do we have serialization/deserialization implementation for Expressions  now? I didn't found :)

[asfimport]

Neal Richardson / @nealrichardson:
I don't believe they are serializable. There has been some discussion of this on the mailing list recently: https://lists.apache.org/thread.html/rb6613e1e0bd205a9e1979e99ee87a4b8ef6d2dc2e0e417c7abdea8a6%40%3Cdev.arrow.apache.org%3E

[asfimport]

Ji Liu / @tianchen92:
got it, thanks for your clarification!