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https://issues.apache.org/jira/browse/LUCENE-5805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14575073#comment-14575073
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ASF subversion and git services commented on LUCENE-5805:
---------------------------------------------------------
Commit 1683853 from [~mikemccand] in branch 'dev/branches/branch_5x'
[ https://svn.apache.org/r1683853 ]
LUCENE-5805: QueryNodeImpl.removeFromParent was doing nothing, in a costly way
> QueryNodeImpl.removeFromParent does a lot of work without any effect
> --------------------------------------------------------------------
>
> Key: LUCENE-5805
> URL: https://issues.apache.org/jira/browse/LUCENE-5805
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/queryparser
> Affects Versions: 4.7.2, 4.9
> Reporter: Christoph Kaser
> Assignee: Michael McCandless
> Attachments: LUCENE-5805.patch
>
>
> The method _removeFromParent_ of _QueryNodeImpl_, calls _getChildren_ on the
> parent and removes any occurrence of "this" from the result.
> However, since a few releases, _getChildren_ returns a *copy* of the children
> list, so the code has no effect (except creating a copy of the children list
> which will then be thrown away).
> Even worse, since _setChildren_ calls _removeFromParent_ on any previous
> child, _setChildren_ now has a complexity of O(n^2) and creates a lot of
> throw-away copies of the children list (for nodes with a lot of children)
> {code}
> public void removeFromParent() {
> if (this.parent != null) {
> List<QueryNode> parentChildren = this.parent.getChildren();
> Iterator<QueryNode> it = parentChildren.iterator();
>
> while (it.hasNext()) {
> if (it.next() == this) {
> it.remove();
> }
> }
>
> this.parent = null;
> }
> }
> {code}
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