Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/20057#discussion_r168971182
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/jdbc/DB2Dialect.scala ---
@@ -49,4 +49,17 @@ private object DB2Dialect extends JdbcDialect {
}
override def isCascadingTruncateTable(): Option[Boolean] = Some(false)
+
+ /**
+ * The SQL query used to truncate a table.
+ * @param table The table to truncate.
+ * @param cascade Whether or not to cascade the truncation. Default
value is the
+ * value of isCascadingTruncateTable(). Ignored for DB2
as it is unsupported.
+ * @return The SQL query to use for truncating a table
+ */
+ override def getTruncateQuery(
+ table: String,
+ cascade: Option[Boolean] = isCascadingTruncateTable): String = {
+ s"TRUNCATE TABLE $table"
+ }
--- End diff --
Since this is the same code from JdbcDialect, it seems we don't need to add
this here.
Not only this DB2Dialect, but also DerbyDialect/MsSQLDialect/MySQLDialect.
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