Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/14240#discussion_r71634358
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/sources/PrunedScanSuite.scala ---
@@ -114,16 +114,15 @@ class PrunedScanSuite extends DataSourceTest with
SharedSQLContext {
testPruning("SELECT * FROM oneToTenPruned", "a", "b")
testPruning("SELECT a, b FROM oneToTenPruned", "a", "b")
testPruning("SELECT b, a FROM oneToTenPruned", "b", "a")
- testPruning("SELECT b, b FROM oneToTenPruned", "b")
+ testPruning("SELECT b, b FROM oneToTenPruned", "b", "b")
+ testPruning("SELECT b as alias_b, b FROM oneToTenPruned", "b")
--- End diff --
```SQL
SELECT b, b FROM oneToTenPruned
```
For Hive Table Scan, we exclude `ProjectExec` from the physical plan but
[the Hive table scan returns two duplicate
columns](https://github.com/apache/spark/blob/865ec32dd997e63aea01a871d1c7b4947f43c111/sql/core/src/main/scala/org/apache/spark/sql/execution/SparkPlanner.scala#L93).
No matter whether `projectSet.size == projects.size` is added or not, the
result is always right.
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