Alan Gates commented on PIG-526:

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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