cloud-fan commented on a change in pull request #30562:
URL: https://github.com/apache/spark/pull/30562#discussion_r534004705
##########
File path:
sql/catalyst/src/main/java/org/apache/spark/sql/connector/catalog/SupportsDelete.java
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@@ -28,6 +28,25 @@
*/
@Evolving
public interface SupportsDelete {
+
+ /**
+ * Checks whether it is possible to delete data from a data source table
that matches filter
+ * expressions.
+ * <p>
+ * Rows should be deleted from the data source iff all of the filter
expressions match.
+ * That is, the expressions must be interpreted as a set of filters that are
ANDed together.
+ * <p>
+ * Spark will call this method to check if the delete is possible without
significant effort.
Review comment:
My worry is that we may change the API back and forth if we don't have a
clear big picture. Right now this patch is not useful as it only changes where
we throw the exception, but I can see that this will be useful when we have the
row-level delete API and we can use the `canDeleteWhere` to decide if we want
to use the row-level API or not.
Do we have a sketch about how the row-level API would look like? It seems
weird if we merge a patch that is useful to something that is not being
designed yet.
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