Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/20057#discussion_r168927408
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/jdbc/DerbyDialect.scala ---
@@ -41,4 +41,16 @@ private object DerbyDialect extends JdbcDialect {
Option(JdbcType("DECIMAL(31,5)", java.sql.Types.DECIMAL))
case _ => None
}
+
+ /**
+ * 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 Derby
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 --
indentation.
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