Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/14746#discussion_r76190937
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/views.scala ---
@@ -105,7 +105,13 @@ case class CreateViewCommand(
}
val sessionState = sparkSession.sessionState
- if (isTemporary) {
+ // 1) CREATE VIEW: create a temp view when users explicitly specify
the keyword TEMPORARY;
+ // otherwise, create a permanent view no matter
whether the temporary view
+ // with the same name exists or not.
+ // 2) ALTER VIEW: alter the temporary view if the temp view exists;
otherwise, try to alter
--- End diff --
question: how can you tell whether it's CREATE VIEW or ALTER VIEW?
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