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https://issues.apache.org/jira/browse/HIVE-5546?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13795280#comment-13795280
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Yin Huai commented on HIVE-5546:
--------------------------------
Based on my understanding, I think that includedStr in
OrcInputFormat.findIncludedColumns(List<Type>, Configuration) is null if and
only if ColumnProjectionUtils.isReadAllColumns(conf)=true.
> A change in ORCInputFormat made by HIVE-4113 was reverted by HIVE-5391
> ----------------------------------------------------------------------
>
> Key: HIVE-5546
> URL: https://issues.apache.org/jira/browse/HIVE-5546
> Project: Hive
> Issue Type: Bug
> Reporter: Yin Huai
> Assignee: Yin Huai
>
> {code}
> 2013-10-15 10:49:49,386 INFO org.apache.hadoop.hive.ql.io.orc.OrcInputFormat:
> included column ids =
> 2013-10-15 10:49:49,386 INFO org.apache.hadoop.hive.ql.io.orc.OrcInputFormat:
> included columns names =
> 2013-10-15 10:49:49,386 INFO org.apache.hadoop.hive.ql.io.orc.OrcInputFormat:
> No ORC pushdown predicate
> 2013-10-15 10:49:49,834 INFO
> org.apache.hadoop.hive.ql.io.HiveContextAwareRecordReader: Processing file
> hdfs://localhost:54310/user/hive/warehouse/web_sales_orc/000000_0
> 2013-10-15 10:49:49,834 INFO org.apache.hadoop.mapred.MapTask:
> numReduceTasks: 1
> 2013-10-15 10:49:49,840 INFO org.apache.hadoop.mapred.MapTask: io.sort.mb =
> 100
> 2013-10-15 10:49:49,968 INFO org.apache.hadoop.mapred.TaskLogsTruncater:
> Initializing logs' truncater with mapRetainSize=-1 and reduceRetainSize=-1
> 2013-10-15 10:49:49,994 INFO org.apache.hadoop.io.nativeio.NativeIO:
> Initialized cache for UID to User mapping with a cache timeout of 14400
> seconds.
> 2013-10-15 10:49:49,994 INFO org.apache.hadoop.io.nativeio.NativeIO: Got
> UserName yhuai for UID 1000 from the native implementation
> 2013-10-15 10:49:49,996 FATAL org.apache.hadoop.mapred.Child: Error running
> child : java.lang.OutOfMemoryError: Java heap space
> at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.<init>(MapTask.java:949)
> at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:428)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:372)
> at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:415)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1136)
> at org.apache.hadoop.mapred.Child.main(Child.java:249)
> {code}
> If includedColumnIds is an empty list, we do not need to read any column
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