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https://issues.apache.org/jira/browse/SPARK-2443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14059960#comment-14059960
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Zongheng Yang commented on SPARK-2443:
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Pull request: https://github.com/apache/spark/pull/1390
> Reading from Partitioned Tables is Slow
> ---------------------------------------
>
> Key: SPARK-2443
> URL: https://issues.apache.org/jira/browse/SPARK-2443
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Michael Armbrust
> Assignee: Zongheng Yang
>
> Here are some numbers, all queries return ~20million:
> {code}
> SELECT COUNT(*) FROM <non partitioned table>
> 5.496467726 s
> SELECT COUNT(*) FROM <partitioned table stored in parquet>
> 50.266666947 s
> SELECT COUNT(*) FROM <same table as previous but loaded with parquetFile
> instead of through hive>
> 2s
> {code}
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