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From "Edward Capriolo (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-4579) Create a SARG interface for RecordReaders
Date Sat, 10 Aug 2013 23:27:48 GMT

    [ https://issues.apache.org/jira/browse/HIVE-4579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13736110#comment-13736110
] 

Edward Capriolo commented on HIVE-4579:
---------------------------------------

{code}
+    private final Stack<ExpressionTree> currentTree =
+        new Stack<ExpressionTree>();
{code}
Can you use Deque and ArrayDeque here instead.
                
> 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, HIVE-4579.D11409.2.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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