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https://issues.apache.org/jira/browse/PIG-526?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12647375#action_12647375
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Alan Gates commented on PIG-526:
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I don't know that pig promises any particular order for keys in a map. Do you
believe we should be maintaining that order in memory, or is your concern that
if we load and store the map it may be stored in a different order?
> 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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