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https://issues.apache.org/jira/browse/PIG-1292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12844247#action_12844247
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Ashutosh Chauhan commented on PIG-1292:
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Currently LoadFunc is an abstract class. OrderedLoadFunc is another abstract
class which extends LoadFunc and adds the method which tells Pig in what order
to read the splits. Similarly, there is IndexableLoadFunc which also extends
LoadFunc and adds the functionality that loader can arbitrarily seek near to
specified keys. Its not hard to imagine that there may exist a loader which can
do both. Currently there can't be such a loader since both of these are
abstract classes. Proposal is to change them to interfaces.
Further, a loader may also provide a guarantee that all instances of a key
appear together in one split. A similar loader is required for map-side groups
PIG-984 . Currently, its assumed that underlying loader is providing data in a
way its expected. We should formalize this assumption by introducing new
interface and checking if loader is implementing it.
> Interface Refinements
> ---------------------
>
> Key: PIG-1292
> URL: https://issues.apache.org/jira/browse/PIG-1292
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.7.0
> Reporter: Ashutosh Chauhan
> Fix For: 0.7.0
>
>
> A loader can't implement both OrderedLoadFunc and IndexableLoadFunc, as both
> are abstract classes instead of being interfaces.
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