Github user dongjoon-hyun commented on a diff in the pull request: https://github.com/apache/spark/pull/19911#discussion_r155328166 --- 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 -- @bolkedebruin . Originally, Spark uses `DROP TABLE` for Overwrite mode. #14086 introduced `TRUNCATE` operation when `JdbcUtils.isCascadingTruncateTable(url) == Some(false)`. So, for PostgresDialect, Spark doesn't use TRUNCATE here.
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