[FLINK-34496] Remove unused method

flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/plan/nodes/exec/serde/JsonSerdeUtil.java

@@ -43,7 +43,6 @@
 import org.apache.flink.table.types.logical.RowType;
 import org.apache.flink.util.jackson.JacksonMapperFactory;
 
-import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.annotation.JsonCreator;
 import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.core.JsonGenerator;
 import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.core.JsonParser;
 import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.core.ObjectCodec;
@@ -70,26 +69,12 @@
 import org.apache.calcite.rex.RexWindowBound;
 
 import java.io.IOException;
-import java.lang.annotation.Annotation;
-import java.lang.reflect.Constructor;
 import java.util.Optional;
 
 /** A utility class that provide abilities for JSON serialization and deserialization. */
 @Internal
 public class JsonSerdeUtil {
 
-    /** Return true if the given class's constructors have @JsonCreator annotation, else false. */
-    public static boolean hasJsonCreatorAnnotation(Class<?> clazz) {
-        for (Constructor<?> constructor : clazz.getDeclaredConstructors()) {
-            for (Annotation annotation : constructor.getAnnotations()) {
-                if (annotation instanceof JsonCreator) {
-                    return true;
-                }
-            }
-        }
-        return false;
-    }
-
     /**
      * Object mapper shared instance to serialize and deserialize the plan. Note that creating and
      * copying of object mappers is expensive and should be avoided.