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https://issues.apache.org/jira/browse/PIG-526?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12647474#action_12647474
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Olga Natkovich commented on PIG-526:
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As of now Pig does not guarantee any order on the keys and we have not seen 
users complaining about it. So I am not sure that we need to do anything. Also, 
at the moment (until we move to 3.0 hopefully not soon.) we can't e breaking 
any existing interfaces.

> Order of <key, value> pairs not preserved in MAP type.
> ------------------------------------------------------
>
>                 Key: PIG-526
>                 URL: https://issues.apache.org/jira/browse/PIG-526
>             Project: Pig
>          Issue Type: Bug
>          Components: data
>    Affects Versions: types_branch
>            Reporter: Hong Tang
>
> PIG uses HashMap to deserialize the Pig MAP type which will not observe the 
> order of <key, value> pairs.

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