Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/19911#discussion_r155340831
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/jdbc/PostgresDialect.scala ---
@@ -100,5 +100,5 @@ private object PostgresDialect extends JdbcDialect {
}
- override def isCascadingTruncateTable(): Option[Boolean] = Some(true)
+ override def isCascadingTruncateTable(): Option[Boolean] = Some(false)
--- End diff --
Thanks for the extended example. The following was the original motivation
of #14086 . I'm not disagree with you on this.
```
`drop/create` is an expensive operation
```
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