Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/14086#discussion_r71610886
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/DataFrameWriter.scala ---
@@ -390,6 +390,12 @@ final class DataFrameWriter[T] private[sql](ds:
Dataset[T]) {
* You can set the following JDBC-specific option(s) for storing JDBC:
* <li>`truncate` (default `false`): use `TRUNCATE TABLE` instead of
`DROP TABLE`.</li>
*
+ * In case of failures, users should turn off `truncate` option to use
`DROP TABLE` again. Also,
+ * due to the different behavior of `TRUNCATE TABLE` among DBMS, it's
not always safe to use this.
+ * MySQLDialect, DB2Dialect, MsSqlServerDialect, DerbyDialect,
DerbyDialect supports this option
--- End diff --
Please correct this.
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