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https://issues.apache.org/jira/browse/HIVE-20255?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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BELUGA BEHR updated HIVE-20255:
-------------------------------
Attachment: HIVE-20255.2.patch
> Review LevelOrderWalker.java
> ----------------------------
>
> Key: HIVE-20255
> URL: https://issues.apache.org/jira/browse/HIVE-20255
> Project: Hive
> Issue Type: Improvement
> Components: Query Planning
> Affects Versions: 3.0.0, 4.0.0
> Reporter: BELUGA BEHR
> Assignee: BELUGA BEHR
> Priority: Minor
> Attachments: HIVE-20255.1.patch, HIVE-20255.2.patch
>
>
> https://github.com/apache/hive/blob/6d890faf22fd1ede3658a5eed097476eab3c67e9/ql/src/java/org/apache/hadoop/hive/ql/lib/LevelOrderWalker.java
> * Make code more concise
> * Fix some check style issues
> {code}
> if (toWalk.get(index).getChildren() != null) {
> for(Node child : toWalk.get(index).getChildren()) {
> {code}
> Actually, the underlying implementation of {{getChildren()}} has to do some
> real work, so do not throw away the work after checking for null. Simply
> call once and store the results.
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