ZiyaZa commented on code in PR #57402:
URL: https://github.com/apache/spark/pull/57402#discussion_r3623217829
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sql/catalyst/src/main/java/org/apache/spark/sql/connector/write/RowLevelOperation.java:
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@@ -54,6 +55,18 @@ default String description() {
*/
Command command();
+ /**
+ * Returns the schema of the rows produced by this operation.
+ * <p>
+ * Spark calls this method during planning. The returned schema must match
the rows returned by
+ * {@link Write#output()} after the write commits successfully.
+ *
+ * @since 4.3.0
+ */
+ default StructType outputSchema() {
+ return new StructType();
Review Comment:
I called .show() on a MERGE query and it showed:
```
++
||
++
++
```
So yes, the schema was empty.
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