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https://issues.apache.org/jira/browse/BEAM-10462?focusedWorklogId=458209&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-458209
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ASF GitHub Bot logged work on BEAM-10462:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 13/Jul/20 17:41
Start Date: 13/Jul/20 17:41
Worklog Time Spent: 10m
Work Description: apilloud opened a new pull request #12240:
URL: https://github.com/apache/beam/pull/12240
NaN values currently cause data corruption for Min() and Max(). Fix and add
tests.
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 458209)
Remaining Estimate: 0h
Time Spent: 10m
> org.apache.beam.sdk.transforms corrupt data when a value is Double.NaN
> ----------------------------------------------------------------------
>
> Key: BEAM-10462
> URL: https://issues.apache.org/jira/browse/BEAM-10462
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Affects Versions: 0.2.0-incubating, 2.22.0
> Reporter: Andrew Pilloud
> Assignee: Andrew Pilloud
> Priority: P1
> Time Spent: 10m
> Remaining Estimate: 0h
>
> When there is a NaN value in the PCollection passed into Min or Max we get a
> random value back due to the way the CombineFn works. Per the SQL standard,
> we should always get NaN back. I'm going to add a special case get the right
> answer.
> Looks like we switched from using Double.compare to `>=` operator in
> https://github.com/apache/beam/commit/21a5b44c3b541ba6c89df5649afe00412df73d10,
> which introduced a data corruption bug.
> A test case demonstrating this issue:
> {code}
> @Test
> public void testDouble() {
> Assert.assertFalse(Double.NaN >= 0.9);
> Assert.assertFalse(0.9 >= Double.NaN);
> Assert.assertFalse(Double.NaN >= Double.POSITIVE_INFINITY);
> Assert.assertFalse(Double.POSITIVE_INFINITY >= Double.NaN);
> Assert.assertTrue(Double.compare(Double.NaN, 0.9) >= 0);
> Assert.assertFalse(Double.compare(0.9, Double.NaN) >= 0);
> Assert.assertTrue(Double.compare(Double.NaN, Double.POSITIVE_INFINITY) >=
> 0);
> Assert.assertFalse(Double.compare(Double.POSITIVE_INFINITY, Double.NaN)
> >= 0);
> }
> {code}
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