Ashutosh Chauhan commented on PIG-796:

Since Pig allows values in a map to be of different types caching the type may 
not be safe. There are two possible alternatives:

a) Find type by introspection every time. This will ensure we are always 
correct and can handle all cases (including when values in maps are of 
different types). This though will incur a performance overhead for every cast 
b) Find the type first time and then cache it for subsequent calls. When 
encountered with different type Pig will bail out with a ClassCastException. 
This will avoid performance overhead but Pig will die when values in maps are 
of different types.

In this performance Vs "handling all cases" trade-off wondering which route 
should we go ?  

> support  conversion from numeric types to chararray
> ---------------------------------------------------
>                 Key: PIG-796
>                 URL: https://issues.apache.org/jira/browse/PIG-796
>             Project: Pig
>          Issue Type: Improvement
>    Affects Versions: 0.2.0
>            Reporter: Olga Natkovich

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