Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/1439#discussion_r15435889
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/execution/HiveTableScan.scala
---
@@ -114,6 +77,7 @@ case class HiveTableScan(
val columnInternalNames =
neededColumnIDs.map(HiveConf.getColumnInternalName(_)).mkString(",")
if (attributes.size == relation.output.size) {
+ // TODO what if duplicated attributes queried?
--- End diff --
A `HiveTableScan` will be only created by `SQLContext#pruneFilterProject`
and `pruneFilterProject` will make sure there is no duplicated attributes.
Let's add a comment to explain it.
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