Polishing.

Adding `@author` tag and a test.

Closes #916

spring-data-relational/src/main/java/org/springframework/data/relational/core/sql/Conditions.java

@@ -26,6 +26,7 @@ import org.springframework.util.Assert;
  *
  * @author Mark Paluch
  * @author Jens Schauder
+ * @author Meng Zuozhu
  * @since 1.1
  * @see SQL
  * @see Expressions

spring-data-relational/src/test/java/org/springframework/data/relational/core/sql/ConditionsUnitTests.java

@@ -0,0 +1,42 @@
+package org.springframework.data.relational.core.sql;
+
+import static org.assertj.core.api.Assertions.*;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+
+/*
+ * Copyright 2021 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+class ConditionsUnitTests {
+
+	@Test // gh-916
+	void notInOfColumnAndExpression() {
+
+		Table table = Table.create("t");
+		Column column = Column.create("col", table);
+		Expression expression = new Literal<>("expression");
+
+		In notIn = Conditions.notIn(column, expression);
+
+		List<Visitable> segments = new ArrayList<>();
+		notIn.visit(segments::add);
+
+		assertThat(notIn.isNotIn()).isTrue();
+		assertThat(segments).containsExactly(notIn, column, table, expression);
+	}
+}