snuyanzin commented on code in PR #28928:
URL: https://github.com/apache/flink/pull/28928#discussion_r3721678688
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flink-core/src/main/java/org/apache/flink/types/variant/Variant.java:
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@@ -20,15 +20,21 @@
import org.apache.flink.annotation.PublicEvolving;
+import java.io.Serializable;
import java.math.BigDecimal;
import java.time.Instant;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.util.List;
-/** Variant represent a semi-structured data. */
+/**
+ * Variant represent a semi-structured data.
+ *
+ * <p>Instances are serializable so that they can be held as member variables
of user-defined
+ * functions or passed into their constructors.
+ */
@PublicEvolving
-public interface Variant {
+public interface Variant extends Serializable {
Review Comment:
why don't we use `Value`?
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