Github user dongjoon-hyun commented on a diff in the pull request: https://github.com/apache/spark/pull/14086#discussion_r71471006 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrameWriter.scala --- @@ -419,8 +422,13 @@ final class DataFrameWriter[T] private[sql](ds: Dataset[T]) { } if (mode == SaveMode.Overwrite && tableExists) { - JdbcUtils.dropTable(conn, table) - tableExists = false + if (extraOptions.getOrElse("truncate", "false").toBoolean && + JdbcUtils.isCascadingTruncateTable(url) == Some(false)) { + JdbcUtils.truncateTable(conn, table) --- End diff -- For my understanding, I will ask one question. Literally, we should not do whatever we do with drop, e.g., we should not drop INDEX, right?
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