Github user bolkedebruin commented on a diff in the pull request:
https://github.com/apache/spark/pull/19911#discussion_r155318011
--- 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 --
Actually @gatorsmile made the comment in #14086 that Postgres cascades
truncates by default. Pointing to the exact same documentation as I do in the
JIRA, but then referring to the opposite behavior. I still stand by my Jira and
included proof (see Jira). Also Postgres supports a rollback of a truncate.
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