[jira] [Created] (ARROW-4250) [C++][Gandiva] Use approximate comparisons for floating point numbers in gandiva-projector-test

["Wes McKinney (JIRA)" <ji...@apache.org>]

Wes McKinney created ARROW-4250:
-----------------------------------

             Summary: [C++][Gandiva] Use approximate comparisons for floating point numbers in gandiva-projector-test
                 Key: ARROW-4250
                 URL: https://issues.apache.org/jira/browse/ARROW-4250
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++, Gandiva
            Reporter: Wes McKinney
             Fix For: 0.13.0


I experienced a failure due to floating point comparison when running the release verification script for 0.12.0 RC2. 

{code}
[==========] Running 13 tests from 1 test case.
[----------] Global test environment set-up.
[----------] 13 tests from TestProjector
[ RUN      ] TestProjector.TestProjectCache
[       OK ] TestProjector.TestProjectCache (584 ms)
[ RUN      ] TestProjector.TestProjectCacheFieldNames
[       OK ] TestProjector.TestProjectCacheFieldNames (319 ms)
[ RUN      ] TestProjector.TestProjectCacheDouble
[       OK ] TestProjector.TestProjectCacheDouble (304 ms)
[ RUN      ] TestProjector.TestProjectCacheFloat
[       OK ] TestProjector.TestProjectCacheFloat (305 ms)
[ RUN      ] TestProjector.TestIntSumSub
[       OK ] TestProjector.TestIntSumSub (200 ms)
[ RUN      ] TestProjector.TestAllIntTypes
[       OK ] TestProjector.TestAllIntTypes (1945 ms)
[ RUN      ] TestProjector.TestExtendedMath
/tmp/arrow-0.12.0.a2ADf/apache-arrow-0.12.0/cpp/src/gandiva/tests/projector_test.cc:358: Failure
Value of: (expected_cbrt)->Equals(outputs.at(0))
  Actual: false
Expected: true
expected array: [
  2.51984,
  2.15443,
  -2.41014,
  2.02469
] actual array: [
  2.51984,
  2.15443,
  -2.41014,
  2.02469
]
{code}



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