Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/20057#discussion_r169688539
--- 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.
--- End diff --
Please add more description about Teradata's lack of `TRUNCATE` syntax
here. Otherwise, people try to make a PR for this mistakenly.
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