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https://issues.apache.org/jira/browse/HIVE-4579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13735462#comment-13735462
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Owen O'Malley commented on HIVE-4579:
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Eric,
In the current subset of SARGS, it isn't strictly required to track nulls,
but if we want to support a little richer expressions we will. For example (c1
= c2) <=> (c1 != c2) is true if either c1 or c2 is null.
Gunther,
* +1 for changing the hive storage handlers to use the SARG interface.
* I'll add a comment about regenerating the test cases.
> Create a SARG interface for RecordReaders
> -----------------------------------------
>
> Key: HIVE-4579
> URL: https://issues.apache.org/jira/browse/HIVE-4579
> Project: Hive
> Issue Type: Improvement
> Reporter: Owen O'Malley
> Assignee: Owen O'Malley
> Attachments: h-4579.patch, HIVE-4579.D11409.1.patch, pushdown.pdf
>
>
> I think we should create a SARG (http://en.wikipedia.org/wiki/Sargable)
> interface for RecordReaders. For a first pass, I'll create an API that uses
> the value stored in hive.io.filter.expr.serialized.
> The desire is to define an simpler interface that the direct AST expression
> that is provided by hive.io.filter.expr.serialized so that the code to
> evaluate expressions can be generalized instead of put inside a particular
> RecordReader.
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