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https://issues.apache.org/jira/browse/TEZ-4248?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17234422#comment-17234422
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László Bodor commented on TEZ-4248:
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thanks [~Marton Bod], I'm about to merge this in 24h
> MRReaderMapred should propagate properties based on config
> ----------------------------------------------------------
>
> Key: TEZ-4248
> URL: https://issues.apache.org/jira/browse/TEZ-4248
> Project: Apache Tez
> Issue Type: New Feature
> Reporter: Marton Bod
> Assignee: Marton Bod
> Priority: Major
> Attachments: TEZ-4248.1.patch, TEZ-4248.2.patch, TEZ-4248.4.patch
>
>
> Based on a new config, MRReaderMapred should pass properites into its
> incremental conf object.
> The config name: tez.mrreader.config.update.properties
> Example use case: in Hive, we would like to push down the projection
> properties (i.e. which columns are selected) set during MRInput
> initialization, in order to have this information available when constructing
> the object inspector (i.e. to create an object inspector which reads only the
> selected columns) during the map operation. To achieve that, in Hive we would
> set the following property: conf.set("tez.mrreader.config.update.properties",
> "hive.io.file.readcolumn.names,hive.io.file.readcolumn.ids"). This would
> ensure we get these two property values propagated into the main conf object.
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