silundong commented on code in PR #4678:
URL: https://github.com/apache/calcite/pull/4678#discussion_r2612662507
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core/src/main/java/org/apache/calcite/adapter/enumerable/PhysType.java:
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@@ -134,6 +134,13 @@ Expression fieldReference(Expression expression, int field,
*/
Expression generateAccessorWithoutNulls(List<Integer> fields);
+ /**
+ * Similar to {@link #generateAccessor(List)} and {@link
#generateAccessorWithoutNulls(List)},
+ * but it's null-aware. If one of the fields is <code>null</code> and this
field is marked as
+ * TRUE in filterNulls, it will return <code>null</code>.
Review Comment:
The function returns a non-null Expression (specifically a
FunctionExpression). It is compiled into a Java Function1 object, which
evaluates to Java null (or a Object[] of keys that may contain Java null) at
runtime, as described above.
Does this clarify your question?
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