beliefer commented on a change in pull request #35768:
URL: https://github.com/apache/spark/pull/35768#discussion_r828861849
##########
File path:
sql/catalyst/src/main/java/org/apache/spark/sql/connector/expressions/Expression.java
##########
@@ -26,8 +26,15 @@
*/
@Evolving
public interface Expression {
+ NamedReference[] EMPTY_REFERENCE = new NamedReference[0];
+
/**
* Format the expression as a human readable SQL-like string.
*/
default String describe() { return this.toString(); }
+
+ /**
+ * List of fields or columns that are referenced by this expression.
+ */
+ NamedReference[] references();
Review comment:
OK
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