[apache#4913] fix(API): fix call bucketTransform arguments failed (ap…

…ache#5268)

### What changes were proposed in this pull request?

fix call bucketTransform arguments failed

### Why are the changes needed?

Fix: apache#4913 

### Does this PR introduce _any_ user-facing change?

no

### How was this patch tested?

tests added

api/src/main/java/org/apache/gravitino/rel/expressions/transforms/Transforms.java

@@ -447,7 +447,7 @@ public String name() {
     /** @return The arguments to the transform. */
     @Override
     public Expression[] arguments() {
-      return ObjectArrays.concat(numBuckets, fields);
+      return ObjectArrays.concat(new Expression[] {numBuckets}, fields, Expression.class);
     }
 
     @Override

api/src/test/java/org/apache/gravitino/rel/TestTransforms.java

@@ -35,11 +35,25 @@
 import org.apache.gravitino.rel.expressions.NamedReference;
 import org.apache.gravitino.rel.expressions.literals.Literals;
 import org.apache.gravitino.rel.expressions.transforms.Transform;
+import org.apache.gravitino.rel.expressions.transforms.Transforms;
 import org.apache.gravitino.rel.types.Types;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
 
 public class TestTransforms {
+  @Test
+  public void testBucketTransform() {
+    Column column = Column.of("col_1", Types.ByteType.get());
+    String[] fieldName = new String[] {column.name()};
+
+    Transform bucket = Transforms.bucket(10, fieldName);
+    Expression[] arguments = bucket.arguments();
+    Assertions.assertEquals(2, arguments.length);
+    Assertions.assertInstanceOf(Literals.LiteralImpl.class, arguments[0]);
+    Assertions.assertEquals(10, ((Literals.LiteralImpl<Integer>) arguments[0]).value());
+    Assertions.assertEquals(fieldName, ((NamedReference.FieldReference) arguments[1]).fieldName());
+  }
+
   @Test
   public void testSingleFieldTransform() {
     Column column = Column.of("col_1", Types.ByteType.get());