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https://issues.apache.org/jira/browse/SPARK-12890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15115558#comment-15115558
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Simeon Simeonov commented on SPARK-12890:
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[~viirya] If schema merging is the cause of the problem then this is clearly a
bug. The resulting schema for a query using only partition columns is
completely independent of the schema in the data files. There is no merging to
do at all.
> Spark SQL query related to only partition fields should not scan the whole
> data.
> --------------------------------------------------------------------------------
>
> Key: SPARK-12890
> URL: https://issues.apache.org/jira/browse/SPARK-12890
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Prakash Chockalingam
>
> I have a SQL query which has only partition fields. The query ends up
> scanning all the data which is unnecessary.
> Example: select max(date) from table, where the table is partitioned by date.
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