Github user dongjoon-hyun commented on a diff in the pull request: https://github.com/apache/spark/pull/20057#discussion_r168883553 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/jdbc/MySQLDialect.scala --- @@ -46,4 +46,16 @@ private case object MySQLDialect extends JdbcDialect { } override def isCascadingTruncateTable(): Option[Boolean] = Some(false) + + /** + * The SQL query used to truncate a table. + * @param table The JDBCOptions. + * @param cascade Whether or not to cascade the truncation. Default value is the + * value of isCascadingTruncateTable(). Ignored for MySQL as it is unsupported. + * @return The SQL query to use for truncating a table + */ + override def getTruncateQuery(table: String, + cascade: Option[Boolean] = isCascadingTruncateTable): String = { --- End diff -- ditto.
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