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From "Dmitriy V. Ryaboy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-1440) Refactor org.apache.pig.data.DataType to use Enums instead of integer constants
Date Sun, 06 Jun 2010 07:28:59 GMT

    [ https://issues.apache.org/jira/browse/PIG-1440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12876011#action_12876011
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Dmitriy V. Ryaboy commented on PIG-1440:
----------------------------------------

I think Enums are great for this, and have wished many a time that the types were Enums while
working with Pig.

I do want to point out, though, that this will affect a lot of user code -- any EvalFunc that
specifies a schema, any loadfunc that implements the metadata options, etc. Are we willing
to break things for our users so soon after 0.7?



> Refactor org.apache.pig.data.DataType to use Enums instead of integer constants
> -------------------------------------------------------------------------------
>
>                 Key: PIG-1440
>                 URL: https://issues.apache.org/jira/browse/PIG-1440
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Gianmarco De Francisci Morales
>            Priority: Minor
>
> Refactoring DataType to use Enums instead of integer constants would provide many benefits,
including:
> * Cleaner code
> * Easier to iterate over Enums
> * Easier to add new Enums without braking backwards compatibility
> * Can use EnumMaps for easily link values to Enums
> * Better support for translation from Enums to Strings and viceversa
> Int (or byte in Pig's case) Enum pattern has several drawbacks as summarized here http://java.sun.com/j2se/1.5.0/docs/guide/language/enums.html
> Drawbacks:
> We have to explicitly convert Enum values to bytes when serializing. This can be done
in DataReaderWriter.
> Possibly higher overhead than simply using bytes.
> Refactoring might be difficult.
> Thoughts?

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