b88b868eb3
Added virtual column support by adding a new resolution role to the query analyzer. Additional virtual columns can be added by adding case expressions to [the new rule](https://github.com/JDrit/spark/blob/virt_columns/sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala#L1026) and my modifying the [logical plan](https://github.com/JDrit/spark/blob/virt_columns/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala#L216) to resolve them. This also solves [SPARK-8003](https://issues.apache.org/jira/browse/SPARK-8003) This allows you to perform queries such as: ```sql select spark__partition__id, count(*) as c from table group by spark__partition__id; ``` Author: Joseph Batchik <josephbatchik@gmail.com> Author: JD <jd@csh.rit.edu> Closes #7478 from JDrit/virt_columns and squashes the following commits: 7932bf0 [Joseph Batchik] adding spark__partition__id to hive as well f8a9c6c [Joseph Batchik] merging in master e49da48 [JD] fixes for @rxin's suggestions 60e120b [JD] fixing test in merge 4bf8554 [JD] merging in master c68bc0f [Joseph Batchik] Adding function register ability to SQLContext and adding a function for spark__partition__id() |
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