[Java] Make ApproxEqualsVisitor accept DiffFunction to make it more flexible

[asfimport]

Currently ApproxEqualsVisitor will accept a epsilon for both float and double compare, and the difference calculation is always Math.abs(f1-f2)

For some cases like Validator it is not very suitable as:

i. it has different epsilon values for float/double

ii. it difference function is not Math.abs(f1-f2)

 

To resolve these, make this visitor accept both float/double epsilons and diff functions.

Reporter: Ji Liu / @tianchen92
Assignee: Ji Liu / @tianchen92

PRs and other links:

• GitHub Pull Request #5155

_{Note: This issue was originally created as ARROW-6311. Please see the migration documentation for further details.}

[asfimport]

Pindikura Ravindra / @pravindra:
Issue resolved by pull request 5155
#5155