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https://issues.apache.org/jira/browse/SPARK-5302?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bob Tiernay updated SPARK-5302:
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Description:
For {{SQLContext}} (not {{HiveContext}}) it would be very convenient to support
a virtual column that maps to part of the the file path, similar to what is
done in Hive for partitions (e.g. {{/data/clicks/dt=2015-01-01/}} where {{dt}}
is a field of type {{TEXT}}).
The API could allow the user to type the column using an appropriate
{{DataType}} instance. This new field could be addressed in SQL statements much
the same as is done in Hive.
As a consequence, pruning of partitions could be possible when executing a
query and also remove the need to materialize a column in each logical
partition that is already encoded in the path name. Furthermore, this would
provide an nice interop and migration strategy for Hive users who may one day
use {{SQLContext}} directly.
was:For {{SQLContext}} (not {{HiveContext}}) it would be very convenient to
support a virtual column that maps to part of the the file path, similar to
what is done in Hive for partitions (e.g. {{/data/clicks/dt=2015-01-01/}}). The
API could allow the user to type the column using an appropriate {{DataType}}
instance. This new field could be addressed in SQL statements much the same as
is done in Hive. As a consequence, pruning of partitions could be possible when
executing a query and also remove the need to materialize a column in each
logical partition that is already encoded in the path name. Furthermore, this
would provide an nice interop and migration strategy for Hive users who may one
day use {{SQLContext}} directly.
> Add support for SQLContext "partition" columns
> ----------------------------------------------
>
> Key: SPARK-5302
> URL: https://issues.apache.org/jira/browse/SPARK-5302
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Reporter: Bob Tiernay
>
> For {{SQLContext}} (not {{HiveContext}}) it would be very convenient to
> support a virtual column that maps to part of the the file path, similar to
> what is done in Hive for partitions (e.g. {{/data/clicks/dt=2015-01-01/}}
> where {{dt}} is a field of type {{TEXT}}).
> The API could allow the user to type the column using an appropriate
> {{DataType}} instance. This new field could be addressed in SQL statements
> much the same as is done in Hive.
> As a consequence, pruning of partitions could be possible when executing a
> query and also remove the need to materialize a column in each logical
> partition that is already encoded in the path name. Furthermore, this would
> provide an nice interop and migration strategy for Hive users who may one day
> use {{SQLContext}} directly.
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