Takeshi Yamamuro created SPARK-21363:
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Summary: Prevent column name duplication in temporary view
Key: SPARK-21363
URL: https://issues.apache.org/jira/browse/SPARK-21363
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.1.1
Reporter: Takeshi Yamamuro
Priority: Minor
In SPARK-20460, we refactored some existing checks for column name duplication.
The master currently allows name duplication for temporary views like an
example below though, IMO we better prevent it along with permanent views (the
master prevents the case for the permanent views).
{code}
scala> Seq((1, 1)).toDF("a", "a").createOrReplaceTempView("t")
scala> sql("SELECT * FROM t").show
+---+---+
| a| a|
+---+---+
| 1| 1|
+---+---+
{code}
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