Github user klinvill commented on a diff in the pull request:
https://github.com/apache/spark/pull/20057#discussion_r169526767
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/jdbc/TeradataDialect.scala ---
@@ -31,4 +31,19 @@ private case object TeradataDialect extends JdbcDialect {
case BooleanType => Option(JdbcType("CHAR(1)", java.sql.Types.CHAR))
case _ => None
}
+
+ 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
Teradata 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 --
Hi @dongjoon-hyun, I was the original author of the TeradataDialect and
@gatorsmile reviewed and committed it. You are correct, Teradata does not
support the TRUNCATE statement. Instead Teradata uses a DELETE statement so you
should be able to use `DELETE FROM $table ALL` instead of `TRUNCATE TABLE
$table`
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