kgyrtkirk commented on code in PR #16741:
URL: https://github.com/apache/druid/pull/16741#discussion_r1682182431


##########
processing/src/main/java/org/apache/druid/query/operator/window/WindowFrame.java:
##########
@@ -21,159 +21,226 @@
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonSubTypes;
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+import com.google.common.collect.ImmutableList;
 import com.google.common.collect.Lists;
-import org.apache.druid.query.operator.ColumnWithDirection;
+import org.apache.druid.annotations.SubclassesMustOverrideEqualsAndHashCode;
+
+import javax.annotation.Nullable;
 
-import java.util.Collections;
 import java.util.List;
 import java.util.Objects;
-import java.util.stream.Collectors;
 
-public class WindowFrame
+@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, property = "type")
+@JsonSubTypes(value = {
+    @JsonSubTypes.Type(name = "unbounded", value = 
WindowFrame.Unbounded.class),

Review Comment:
   this is more like just syntactic sugar for native queries; yes it could also 
be `{type: rows }` - that's kinda the same - `unbounded` is just more explicit 
if its present in the native query.



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