hemanthmeka commented on issue #25570: [SPARK-23519][SQL] create view should work from query with duplicate output columns URL: https://github.com/apache/spark/pull/25570#issuecomment-524820928 > > ALTER VIEW AS gets its schema from the new SELECT query provided. So it is not effected > > But `sql("ALTER VIEW v23519 AS SELECT c1, c1 FROM t23519")` also fails with an exception? > > ```scala > org.apache.spark.sql.AnalysisException: Found duplicate column(s) in the view definition: `c1`; > [info] at org.apache.spark.sql.util.SchemaUtils$.checkColumnNameDuplication(SchemaUtils.scala:90) > [info] at org.apache.spark.sql.util.SchemaUtils$.checkColumnNameDuplication(SchemaUtils.scala:70) > [info] at org.apache.spark.sql.execution.command.ViewHelper$.generateViewProperties(views.scala:369) > [info] at org.apache.spark.sql.execution.command.AlterViewAsCommand.alterPermanentView(views.scala:301) > ``` From the comments in CreateViewCommand.run('**Nothing we need to retain from the old view, so ...**') i get the impression that alter always creates a new definition with schema from query, then c1, c1 should throw analysis exception. Which should be the right behaviour? Any reference?
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