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https://issues.apache.org/jira/browse/OLINGO-1009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15477642#comment-15477642
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Ramesh Reddy commented on OLINGO-1009:
--------------------------------------

[~shawkins] Alright, I have modified to what you are saying and here is the 
link 
https://github.com/rareddy/olingo-odata4/commit/cbecb72effd70b29cd76cc2727855dd768140301

On the Stack Vs Set, I found that with an Entity object that has cycle, when 
computing the hashcode recursively and ending up with Stackoverflow, so kept 
the Stack as is.

> Provide serilization support for $levels with $expand
> -----------------------------------------------------
>
>                 Key: OLINGO-1009
>                 URL: https://issues.apache.org/jira/browse/OLINGO-1009
>             Project: Olingo
>          Issue Type: New Feature
>          Components: odata4-server
>    Affects Versions: (Java) V4 4.0.0-beta-01
>            Reporter: Ramesh Reddy
>            Assignee: Ramesh Reddy
>             Fix For: (Java) V4 4.3.0
>
>
> Currently Olingo parses the query with $expand with $levels construct, 
> however if the payload contains the nesting of the entities, it does not 
> serialize to the defined $levels



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