Github user bolkedebruin commented on a diff in the pull request:
https://github.com/apache/spark/pull/19911#discussion_r155337956
--- 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 --
Please note that drop/create is an expensive operation. In addition I don't
think (imho) spark should ever do a drop/create as it changes the schema.
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