HHH-8955 - added HSQL dialect support for database trunc function

hibernate-core/src/main/java/org/hibernate/dialect/HSQLDialect.java

@@ -240,6 +240,7 @@ public class HSQLDialect extends Dialect {
 		registerFunction( "round", new StandardSQLFunction( "round" ) );
 		registerFunction( "roundmagic", new StandardSQLFunction( "roundmagic" ) );
 		registerFunction( "truncate", new StandardSQLFunction( "truncate" ) );
+		registerFunction( "trunc", new StandardSQLFunction( "trunc" ) );
 
 		registerFunction( "ceiling", new StandardSQLFunction( "ceiling" ) );
 		registerFunction( "floor", new StandardSQLFunction( "floor" ) );

hibernate-core/src/test/java/org/hibernate/test/dialect/function/HSQLTruncFunctionTest.java

@@ -0,0 +1,92 @@
+/*
+ * 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.test.dialect.function;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+
+import org.hibernate.dialect.HSQLDialect;
+import org.hibernate.jpa.test.BaseEntityManagerFunctionalTestCase;
+
+import org.hibernate.testing.RequiresDialect;
+import org.junit.Test;
+
+import static org.hibernate.testing.transaction.TransactionUtil.doInJPA;
+import static org.junit.Assert.assertEquals;
+
+/**
+  @author Vlad Mihalcea
+ */
+@RequiresDialect( HSQLDialect.class )
+public class HSQLTruncFunctionTest extends BaseEntityManagerFunctionalTestCase {
+
+	@Override
+	protected Class<?>[] getAnnotatedClasses() {
+		return new Class<?>[] {
+				Person.class
+		};
+	}
+
+	@Test
+	public void testTruncateAndTruncFunctions(){
+		doInJPA( this::entityManagerFactory, entityManager -> {
+			Person person = new Person();
+			person.setId( 1L );
+			person.setHighestScore( 99.56d );
+			entityManager.persist( person );
+		} );
+
+		doInJPA( this::entityManagerFactory, entityManager -> {
+			Double score = entityManager.createQuery(
+				"select truncate(p.highestScore, 1) " +
+				"from Person p " +
+				"where p.id = :id", Double.class)
+			.setParameter( "id", 1L )
+			.getSingleResult();
+
+			assertEquals( 99.5d, score, 0.01 );
+		} );
+
+		doInJPA( this::entityManagerFactory, entityManager -> {
+			Double score = entityManager.createQuery(
+				"select trunc(p.highestScore, 1) " +
+				"from Person p " +
+				"where p.id = :id", Double.class)
+			.setParameter( "id", 1L )
+			.getSingleResult();
+
+			assertEquals( 99.5d, score, 0.01 );
+		} );
+		
+	}
+
+	@Entity(name = "Person")
+	public static class Person {
+
+		@Id
+		private Long id;
+
+		private Double highestScore;
+
+		public Long getId() {
+			return id;
+		}
+
+		public void setId(Long id) {
+			this.id = id;
+		}
+
+		public Double getHighestScore() {
+			return highestScore;
+		}
+
+		public void setHighestScore(Double highestScore) {
+			this.highestScore = highestScore;
+		}
+	}
+
+}