Proposal to remove float from Pig data types

                 Key: PIG-788
             Project: Pig
          Issue Type: Improvement
          Components: impl
    Affects Versions: 0.2.0
            Reporter: Alan Gates

Pig would like to use the new Hadoop Avro serialization package to pass data 
between MR jobs, and eventually between Pig and UDFs that are not written in 
Java.  Avro will not be supporting the float data type, but only double (see 
AVRO-17).  Pig currently support both float and double.  Double is the default 
floating point type (so if the user says x + 1.0, 1.0 is taken to be a double, 
not a float).  Float was initially included in the list of Pig types because 
Hadoop supported it as one of the Writable types, and we were trying to make 
sure all of Hadoop's writable types could be represented in Pig.  

In practice we do not see anyone using the float type.   In order to be able to 
easily use Avro I propose dropping the float type.  

Please speak up if you are using the float type and you have a compelling 
reason not to use double.

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