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https://issues.apache.org/jira/browse/HIVE-1040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13105732#comment-13105732
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John Sichi commented on HIVE-1040:
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Another benefit is to show us exactly what is being masked out just by
examining the .q.out files (something that currently makes some tests give less
coverage than they should).
> use sed rather than diff for masking out noise in diff-based tests
> ------------------------------------------------------------------
>
> Key: HIVE-1040
> URL: https://issues.apache.org/jira/browse/HIVE-1040
> Project: Hive
> Issue Type: Improvement
> Components: Testing Infrastructure
> Affects Versions: 0.4.1
> Reporter: John Sichi
> Priority: Minor
>
> The current diff -I approach has two problems: (1) it does not allow
> resolution finer than line-level, so it's impossible to mask out pattern
> occurrences within a line, and (2) it produces unmasked files, so if you run
> diff on the command line to compare the result .q.out with the checked-in
> file, you see the noise.
> My suggestion is to first run sed to replace noise patterns with an
> unlikely-to-occur string like ZYZZYZVA, and then diff the pre-masked files
> without using any -I.
> This would require a one-time hit to update all existing .q.out files so that
> they would contain the pre-masked results.
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