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https://issues.apache.org/jira/browse/IMPALA-7780?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16667720#comment-16667720
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Pooja Nilangekar commented on IMPALA-7780:
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I have faced the issue of different estimates earlier. After asking around and
poking though the dataload, I found that the file sizes and hence the estimates
may vary between different instances of data load. You might end up using
less/more disk space to load the exact same data on the same/ another machine
with identical specs. So I am not sure rebase would actually solve this issue.
> Rebase PlannerTest expected output for estimates, errors
> --------------------------------------------------------
>
> Key: IMPALA-7780
> URL: https://issues.apache.org/jira/browse/IMPALA-7780
> Project: IMPALA
> Issue Type: Improvement
> Components: Frontend
> Affects Versions: Impala 3.0
> Reporter: Paul Rogers
> Priority: Trivial
>
> The front-end includes the {{PlannerTest}} test which works by running a
> query, writing the plan to a file, comparing selected parts of the file to
> expected results, and flagging if the results differ.
> A plan includes some things we test (operators) and some we do not (text of
> error messages, value of memory estimates). Over time the expected and actual
> files have drifted apart. Example:
> {noformat}
> Expected: partitions=1/1 files=2 size=54.20MB
> Actual: partitions=1/1 files=2 size=54.21MB
> {noformat}
> While the tests still pass (because we ignore the parts which have drifted),
> it is a pain to track down issues because we must learn to manually ignore
> "unimportant" differences.
> This ticket asks to "rebase" planner tests on the latest results, copying
> into the expected results file the current "noise" values from the actual
> results.
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