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https://issues.apache.org/jira/browse/PIG-788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12708512#action_12708512
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Alan Gates commented on PIG-788:
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Reading the latest comments on AVRO-17 it looks like they are leaning towards 
keeping float, so this may be becoming a non-issue.

> Proposal to remove float from Pig data types
> --------------------------------------------
>
>                 Key: PIG-788
>                 URL: https://issues.apache.org/jira/browse/PIG-788
>             Project: Pig
>          Issue Type: Improvement
>          Components: impl
>    Affects Versions: 0.2.0
>            Reporter: Alan Gates
>            Assignee: 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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