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https://issues.apache.org/jira/browse/SPARK-25635?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-25635:
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Assignee: Dongjoon Hyun (was: Apache Spark)
> Support selective direct encoding in native ORC write
> -----------------------------------------------------
>
> Key: SPARK-25635
> URL: https://issues.apache.org/jira/browse/SPARK-25635
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Dongjoon Hyun
> Assignee: Dongjoon Hyun
> Priority: Major
>
> Before ORC 1.5.3, `orc.dictionary.key.threshold` and
> `hive.exec.orc.dictionary.key.size.threshold` is applied for all columns.
> This is a big huddle to enable dictionary encoding.
> From ORC 1.5.3, `orc.column.encoding.direct` is added to enforce direct
> encoding selectively in a column-wise manner. This issue aims to add that
> feature by upgrading ORC from 1.5.2 to 1.5.3.
> The followings are the patches in ORC 1.5.3 and this feature is the only one
> related to Spark directly.
> {code}
> ORC-406: ORC: Char(n) and Varchar(n) writers truncate to n bytes & corrupts
> multi-byte data (gopalv)
> ORC-403: [C++] Add checks to avoid invalid offsets in InputStream
> ORC-405. Remove calcite as a dependency from the benchmarks.
> ORC-375: Fix libhdfs on gcc7 by adding #include <functional> two places.
> ORC-383: Parallel builds fails with ConcurrentModificationException
> ORC-382: Apache rat exclusions + add rat check to travis
> ORC-401: Fix incorrect quoting in specification.
> ORC-385. Change RecordReader to extend Closeable.
> ORC-384: [C++] fix memory leak when loading non-ORC files
> ORC-391: [c++] parseType does not accept underscore in the field name
> ORC-397. Allow selective disabling of dictionary encoding. Original patch was
> by Mithun Radhakrishnan.
> ORC-389: Add ability to not decode Acid metadata columns
> {code}
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