cloud-fan commented on a change in pull request #30267:
URL: https://github.com/apache/spark/pull/30267#discussion_r518519970
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File path:
sql/catalyst/src/main/java/org/apache/spark/sql/connector/catalog/TableCatalog.java
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@@ -162,6 +162,29 @@ Table alterTable(
*/
boolean dropTable(Identifier ident);
+ /**
+ * Drop a table in the catalog with an option to purge.
+ * <p>
+ * If the catalog supports views and contains a view for the identifier and
not a table, this
+ * must not drop the view and must return false.
+ * <p>
+ * If the purge option is set to false, the default implementation falls
back to
+ * {@link #dropTable(Identifier)} dropTable}. Otherwise, it throws
+ * {@link UnsupportedOperationException}.
Review comment:
we should mention that, people need to overwrite this method to support
the purge option.
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