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https://issues.apache.org/jira/browse/SPARK-32485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17167881#comment-17167881
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Michael Munday commented on SPARK-32485:
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This is for Linux running on the IBM Z platform (s390x) which is a big endian
platform. I have a PR open to fix this, I will update it with this issue number
shortly. Thanks.
> RecordBinaryComparatorSuite test failures on big-endian systems
> ---------------------------------------------------------------
>
> Key: SPARK-32485
> URL: https://issues.apache.org/jira/browse/SPARK-32485
> Project: Spark
> Issue Type: Bug
> Components: Tests
> Affects Versions: 3.0.0
> Reporter: Michael Munday
> Priority: Minor
> Labels: endianness
>
> The fix for SPARK-29918 broke two tests on big-endian systems:
> * testBinaryComparatorWhenSubtractionIsDivisibleByMaxIntValue
> * testBinaryComparatorWhenSubtractionCanOverflowLongValue
> These tests date from a time where subtraction was being used to do
> multi-byte comparisons. They try to trigger old bugs by feeding specific
> values into the comparison. However the fix for SPARK-29918 modified the
> order in which bytes are compared when comparing 8 bytes at a time on
> little-endian systems (to match the normal byte-by-byte comparison). This fix
> did not affect big-endian systems. However the expected output of the tests
> was modified for all systems regardless of endianness. So the tests broke on
> big-endian systems.
> It is also not clear that the values compared in the tests match the original
> intent of the tests now that the bytes in those values are compared in order
> (equivalent to the bytes in the values being reversed).
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