HHH-15868 add truncate() to HibernateCriteriaBuilder

hibernate-core/src/main/java/org/hibernate/query/criteria/HibernateCriteriaBuilder.java

@@ -216,6 +216,16 @@ public interface HibernateCriteriaBuilder extends CriteriaBuilder {
 	 */
 	<T extends Number> JpaExpression<T> round(Expression<T> x, Integer n);
 
+	/**
+	 * Create an expression that returns the first argument
+	 * truncated to the number of decimal places given by the
+	 * second argument.
+	 * @param x base
+	 * @param n number of decimal places
+	 * @return the truncated value
+	 */
+	<T extends Number> JpaExpression<T> truncate(Expression<T> x, Integer n);
+
 	/**
 	 *  Create expression to return current local date.
 	 *  @return expression for current date

hibernate-core/src/main/java/org/hibernate/query/criteria/spi/HibernateCriteriaBuilderDelegate.java

@@ -262,6 +262,11 @@ public class HibernateCriteriaBuilderDelegate implements HibernateCriteriaBuilde
 		return criteriaBuilder.round( x, n );
 	}
 
+	@Override
+	public <T extends Number> JpaExpression<T> truncate(Expression<T> x, Integer n) {
+		return criteriaBuilder.truncate( x, n );
+	}
+
 	@Override
 	public JpaExpression<LocalDate> localDate() {
 		return criteriaBuilder.localDate();

hibernate-core/src/main/java/org/hibernate/query/sqm/internal/SqmCriteriaNodeBuilder.java

@@ -920,6 +920,16 @@ public class SqmCriteriaNodeBuilder implements NodeBuilder, SqmCreationContext,
 		);
 	}
 
+	@Override
+	public <T extends Number> JpaExpression<T> truncate(Expression<T> x, Integer n) {
+		return getFunctionDescriptor( "truncate" ).generateSqmExpression(
+				Arrays.asList( (SqmExpression<?>) x, value( n ) ),
+				null,
+				queryEngine,
+				getJpaMetamodel().getTypeConfiguration()
+		);
+	}
+
 	@Override
 	public <N extends Number> SqmExpression<N> neg(Expression<N> x) {
 		final SqmExpression<N> sqmExpression = (SqmExpression<N>) x;