Fix same hashCodes an different queries with include and exclude

Author: 13wjdgk

Diff for: spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/query/Field.java

@@ -37,6 +37,7 @@
  * @author Mark Paluch
  * @author Owen Q
  * @author Kirill Egorov
+ * @author GaEun Kim
  */
 public class Field {
 
@@ -286,7 +287,7 @@ public boolean equals(@Nullable Object o) {
 	@Override
 	public int hashCode() {
 
-		int result = ObjectUtils.nullSafeHashCode(criteria);
+		int result = ObjectUtils.nullSafeHashCode(criteria.toString());
 		result = 31 * result + ObjectUtils.nullSafeHashCode(slices);
 		result = 31 * result + ObjectUtils.nullSafeHashCode(elemMatches);
 		result = 31 * result + ObjectUtils.nullSafeHashCode(positionKey);

Diff for: spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/query/FieldUnitTests.java

@@ -28,6 +28,7 @@
  * @author Owen Q
  * @author Mark Paluch
  * @author Kirill Egorov
+ * @author GaEun Kim
  */
 class FieldUnitTests {
 
@@ -85,4 +86,22 @@ void overriddenExclusionMethodsCreateEqualFields() {
 
 		assertThat(left).isEqualTo(right);
 	}
+
+	@Test
+	void assertDifferentHashCodesForExcludeAndIncludeQueries() {
+
+		Query queryWithExclude = new Query();
+		queryWithExclude.fields().exclude("key1");
+		queryWithExclude.fields().exclude("key2");
+		queryWithExclude.fields().exclude("field1");
+		queryWithExclude.fields().exclude("field2");
+
+		Query queryWithInclude = new Query();
+		queryWithInclude.fields().include("key1");
+		queryWithInclude.fields().include("key2");
+		queryWithInclude.fields().include("field1");
+		queryWithInclude.fields().include("field2");
+
+		assertThat(queryWithExclude.hashCode()).isNotEqualTo(queryWithInclude.hashCode());
+	}
 }