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https://issues.apache.org/jira/browse/KYLIN-3580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16628584#comment-16628584
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ASF GitHub Bot commented on KYLIN-3580:
---------------------------------------
shaofengshi commented on a change in pull request #252: KYLIN-3580 Avoid using
entrySet to add elements
URL: https://github.com/apache/kylin/pull/252#discussion_r220143396
##########
File path:
core-cube/src/main/java/org/apache/kylin/cube/cuboid/algorithm/CuboidStatsUtil.java
##########
@@ -87,7 +88,11 @@ public int compare(Map.Entry<Long, Long> o1,
Map.Entry<Long, Long> o2) {
return o1.getValue().compareTo(o2.getValue());
}
});
- sortedStatsSet.addAll(statistics.entrySet());
+ //sortedStatsSet.addAll(statistics.entrySet()); KYLIN-3580
+ Iterator<Map.Entry<Long, Long>> entryIterator =
statistics.entrySet().iterator();
Review comment:
Please use "for ( element : a set) " expression, that is more clear than
this.
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> CuboidStatsUtil#complementRowCountForMandatoryCuboids uses entrySet to add
> elements
> -----------------------------------------------------------------------------------
>
> Key: KYLIN-3580
> URL: https://issues.apache.org/jira/browse/KYLIN-3580
> Project: Kylin
> Issue Type: Bug
> Reporter: Ted Yu
> Assignee: Lijun Cao
> Priority: Major
> Fix For: v2.6.0
>
>
> Here is related code:
> {code}
> sortedStatsSet.addAll(statistics.entrySet());
> {code}
> The entrySet() method is allowed to return a view of the underlying Map in
> which a single Entry object is reused and returned during the iteration.
> When iterating through such a Map, the Entry value is only valid until you
> advance to the next iteration.
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