Github user Stephan202 commented on a diff in the pull request:
https://github.com/apache/spark/pull/20057#discussion_r165814532
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/jdbc/DB2Dialect.scala ---
@@ -49,4 +49,16 @@ private object DB2Dialect 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()
--- End diff --
For dialects not supporting cascading, should the documentation perhaps
indicate that the `cascade` parameter is ignored?
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