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https://issues.apache.org/jira/browse/HIVE-4579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13669027#comment-13669027
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Owen O'Malley commented on HIVE-4579:
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I need to add the null-safe equals as an primitive clause. Having NULL as a
boolean value makes things strange and I need to keep in mind that:
* P and not P is not always false (it may be null)
* P or not P is not always true (it may be null)
I see why you wanted HIVE-4478 since if a column has no nulls, the rules for
predicate evaluation are much tighter. :) Although we are going to want it in
the index as well as in the stripe metadata.
> 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, 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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