HHH-17234 - Add test case and fix for issue (change the "!=" not equal operator to "<>")

Signed-off-by: Jan Schatteman <jschatte@redhat.com>

hibernate-core/src/main/java/org/hibernate/query/sqm/ComparisonOperator.java

@@ -63,7 +63,7 @@ public enum ComparisonOperator {
 
 		@Override
 		public String sqlText() {
-			return "!=";
+			return "<>";
 		}
 	},
 	NOT_DISTINCT_FROM {

hibernate-core/src/test/java/org/hibernate/orm/test/jpa/criteria/EntityUseJoinedSubclassOptimizationTest.java

@@ -189,7 +189,7 @@ public class EntityUseJoinedSubclassOptimizationTest {
 									"when t1_1.id is not null then 6 " +
 									"when t1_2.id is not null then 1 " +
 									"when t1_6.id is not null then 4 " +
-									"end!=2",
+									"end<>2",
 							sqlStatementInterceptor.getSqlQueries().get( 0 )
 					);
 				}

hibernate-core/src/test/java/org/hibernate/orm/test/jpa/criteria/EntityUseSingleTableOptimizationTest.java

@@ -129,7 +129,7 @@ public class EntityUseSingleTableOptimizationTest {
 									"t1_0.name " +
 									"from Thing t1_0 " +
 									"where " +
-									"t1_0.DTYPE!='House'",
+									"t1_0.DTYPE<>'House'",
 							sqlStatementInterceptor.getSqlQueries().get( 0 )
 					);
 				}

hibernate-core/src/test/java/org/hibernate/orm/test/jpa/criteria/EntityUseUnionSubclassOptimizationTest.java

@@ -145,7 +145,7 @@ public class EntityUseUnionSubclassOptimizationTest {
 									"select id, null as nr, name, null as seats, null as architectName, null as doors, null as familyName, 4 as clazz_ from Vehicle" +
 									") t1_0 " +
 									"where " +
-									"t1_0.clazz_!=2",
+									"t1_0.clazz_<>2",
 							sqlStatementInterceptor.getSqlQueries().get( 0 )
 					);
 				}

hibernate-core/src/test/java/org/hibernate/orm/test/query/hql/NotEqualComparisonOperatorTest.java

@@ -0,0 +1,95 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.orm.test.query.hql;
+
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.JiraKey;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+/**
+ * @author Jan Schatteman
+ *  @author Mark Russell
+ */
+@DomainModel(
+		annotatedClasses = { NotEqualComparisonOperatorTest.IntegerTextMapEntity.class }
+)
+@SessionFactory
+public class NotEqualComparisonOperatorTest {
+
+	@Test
+	@JiraKey( value = "HHH-17234")
+	public void testNotEqualComparison(SessionFactoryScope scope) {
+		scope.inTransaction(
+				session -> {
+					var entityOne = new IntegerTextMapEntity(1, "One");
+					var entityNegativeOne = new IntegerTextMapEntity(-1, "Negative One");
+					session.persist(entityOne);
+					session.persist(entityNegativeOne);
+
+					var tableContents = session.createQuery(
+							"SELECT x FROM IntegerTextMapEntity x", IntegerTextMapEntity.class ).getResultList();
+					assertNotNull(tableContents);
+					assertEquals(2, tableContents.size());
+
+					var notEqualOpResults = session.createQuery(
+							"SELECT x FROM IntegerTextMapEntity x WHERE x.intValue <> -1", IntegerTextMapEntity.class).getResultList();
+					assertNotNull(notEqualOpResults);
+					assertEquals(1, notEqualOpResults.size());
+				}
+		);
+	}
+
+	@Entity( name = "IntegerTextMapEntity" )
+	public static class IntegerTextMapEntity {
+		@Id
+		@GeneratedValue
+		private Long id;
+
+		private Integer intValue;
+
+		private String textValue;
+
+		public IntegerTextMapEntity(int intValue, String textValue) {
+			this.intValue = intValue;
+			this.textValue = textValue;
+		}
+
+		public Long getId() {
+			return id;
+		}
+
+		public void setId(Long id) {
+			this.id = id;
+		}
+
+		public Integer getIntValue() {
+			return intValue;
+		}
+
+		public void setIntValue(Integer intValue) {
+			this.intValue = intValue;
+		}
+
+		public String getTextValue() {
+			return textValue;
+		}
+
+		public void setTextValue(String textValue) {
+			this.textValue = textValue;
+		}
+	}
+
+}