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https://issues.apache.org/jira/browse/HIVE-4579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13669472#comment-13669472
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Owen O'Malley commented on HIVE-4579:
-------------------------------------
Just to be clear, the sql semantics are:
|| Arg1 || Arg2 || Arg1 OR Arg2 ||
| false | false | false |
| false | true | true |
| false | null | null |
| true | false | true |
| true | true | true |
| true | null | true |
| null | false | null |
| null | true | true |
| null | null | null |
|| Arg1 || Arg2 || Arg1 AND Arg2 ||
| false | false | false |
| false | true | false |
| false | null | false |
| true | false | false |
| true | true | true |
| true | null | null |
| null | false | false |
| null | true | null |
| null | null | null |
|| Arg1 || NOT Arg1 ||
| false | true |
| true | false |
| null | null |
> 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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