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https://issues.apache.org/jira/browse/HIVE-8515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14176077#comment-14176077
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Alan Gates commented on HIVE-8515:
----------------------------------
The issue is in OrcInputFormat.getReader:
{code}
if (split.hasBase()) {
bucket = AcidUtils.parseBaseBucketFilename(split.getPath(), conf)
.getBucket();
reader = OrcFile.createReader(path, OrcFile.readerOptions(conf));
final List<OrcProto.Type> types = reader.getTypes();
setIncludedColumns(readOptions, types, conf, split.isOriginal());
setSearchArgument(readOptions, types, conf, split.isOriginal());
} else {
bucket = (int) split.getStart();
reader = null;
}
}
{code}
setIncludeColumns is called if there is a base, but not if there isn't.
> Column projection not being pushed to ORC delta files
> -----------------------------------------------------
>
> Key: HIVE-8515
> URL: https://issues.apache.org/jira/browse/HIVE-8515
> Project: Hive
> Issue Type: Bug
> Affects Versions: 0.14.0
> Reporter: Alan Gates
> Assignee: Alan Gates
>
> Currently when only some columns are projected, that projection is pushed to
> the base file but not to delta files. This does not cause incorrect results
> (the columns are projected out later in the query execution), but it is less
> efficient then it could be.
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