PERFORMANCE: HDataType.getWritableComparableTypes() method can use the supplied 
key type rather than figuring it out using instanceof

                 Key: PIG-677
             Project: Pig
          Issue Type: Improvement
    Affects Versions: types_branch
            Reporter: Pradeep Kamath
            Priority: Minor
             Fix For: types_branch

Currently HDataType.getWritableComparableTypes method gets the object for which 
a NullableXXX object needs to be returned and also the key type which indicates 
the data types of the incoming object. However by default the method calls 
DataType.findType on the incoming object which inturn does an instanceof with 
if-else to figure out the type. This can be avoided since the second argument, 
keyType, already has the type of the incoming object

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