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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2016/03/01 00:18:18 UTC
[jira] [Commented] (SPARK-13582) Improve performance of parquet
reader with dictionary encoding
[ https://issues.apache.org/jira/browse/SPARK-13582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15172841#comment-15172841 ]
Apache Spark commented on SPARK-13582:
--------------------------------------
User 'davies' has created a pull request for this issue:
https://github.com/apache/spark/pull/11437
> Improve performance of parquet reader with dictionary encoding
> --------------------------------------------------------------
>
> Key: SPARK-13582
> URL: https://issues.apache.org/jira/browse/SPARK-13582
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Davies Liu
> Assignee: Davies Liu
>
> Right now, we replace the ids with value from a dictionary before accessing a column. We could defer that, especially when some rows are filtered out, we will not lookup this dictionary for those rows.
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