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From "BELUGA BEHR (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-20255) Review LevelOrderWalker.java
Date Fri, 30 Nov 2018 15:33:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-20255?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

BELUGA BEHR updated HIVE-20255:
-------------------------------
    Status: Open  (was: Patch Available)

> 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, HIVE-20255.3.patch, HIVE-20255.4.patch,
HIVE-20255.5.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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