HHH-16699 add repeat() function to criteria API

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

@@ -1196,6 +1196,36 @@ public interface HibernateCriteriaBuilder extends CriteriaBuilder {
 			Expression<Integer> length,
 			Expression<Character> padChar);
 
+	/**
+	 * Concatenate the given string expression with itself the given number of times.
+	 *
+	 * @param x the string expression to concatenate
+	 * @param times the number of times it should be repeated
+	 *
+	 * @return repeat expression
+	 */
+	JpaFunction<String> repeat(Expression<String> x, Expression<Integer> times);
+
+	/**
+	 * Concatenate the given string expression with itself the given number of times.
+	 *
+	 * @param x the string expression to concatenate
+	 * @param times the number of times it should be repeated
+	 *
+	 * @return repeat expression
+	 */
+	JpaFunction<String> repeat(Expression<String> x, int times);
+
+	/**
+	 * Concatenate the given string expression with itself the given number of times.
+	 *
+	 * @param x the string expression to concatenate
+	 * @param times the number of times it should be repeated
+	 *
+	 * @return repeat expression
+	 */
+	JpaFunction<String> repeat(String x, Expression<Integer> times);
+
 	/**
 	 * @see #left(Expression, Expression)
 	 */

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

@@ -1464,6 +1464,21 @@ public class HibernateCriteriaBuilderDelegate implements HibernateCriteriaBuilde
 		return criteriaBuilder.pad( ts, x, length, padChar );
 	}
 
+	@Override
+	public JpaFunction<String> repeat(Expression<String> x, Expression<Integer> times) {
+		return criteriaBuilder.repeat( x, times );
+	}
+
+	@Override
+	public JpaFunction<String> repeat(Expression<String> x, int times) {
+		return criteriaBuilder.repeat( x, times );
+	}
+
+	@Override
+	public JpaFunction<String> repeat(String x, Expression<Integer> times) {
+		return criteriaBuilder.repeat( x, times );
+	}
+
 	@Override
 	public JpaFunction<String> left(Expression<String> x, int length) {
 		return criteriaBuilder.left( x, length );

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

@@ -57,6 +57,7 @@ import org.hibernate.query.criteria.JpaCompoundSelection;
 import org.hibernate.query.criteria.JpaCriteriaQuery;
 import org.hibernate.query.criteria.JpaCteCriteriaAttribute;
 import org.hibernate.query.criteria.JpaExpression;
+import org.hibernate.query.criteria.JpaFunction;
 import org.hibernate.query.criteria.JpaOrder;
 import org.hibernate.query.criteria.JpaPredicate;
 import org.hibernate.query.criteria.JpaSearchOrder;
@@ -2967,6 +2968,26 @@ public class SqmCriteriaNodeBuilder implements NodeBuilder, SqmCreationContext,
 		);
 	}
 
+	@Override
+	public JpaFunction<String> repeat(Expression<String> x, Expression<Integer> times) {
+		return getFunctionDescriptor( "repeat" ).generateSqmExpression(
+				asList( (SqmExpression<String>) x, (SqmExpression<Integer>) times ),
+				null,
+				getQueryEngine(),
+				getJpaMetamodel().getTypeConfiguration()
+		);
+	}
+
+	@Override
+	public JpaFunction<String> repeat(Expression<String> x, int times) {
+		return repeat( x, value( times ) );
+	}
+
+	@Override
+	public JpaFunction<String> repeat(String x, Expression<Integer> times) {
+		return repeat( value( x), times );
+	}
+
 	@Override
 	public SqmFunction<String> left(Expression<String> x, int length) {
 		return left( x, value( length ) );

hibernate-core/src/test/java/org/hibernate/orm/test/query/criteria/CriteriaBuilderNonStandardFunctionsTest.java

@@ -309,6 +309,16 @@ public class CriteriaBuilderNonStandardFunctionsTest {
 		} );
 	}
 
+	@Test
+	@RequiresDialectFeature(feature = DialectFeatureChecks.SupportsRepeat.class)
+	public void testRepeat(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			HibernateCriteriaBuilder cb = session.getCriteriaBuilder();
+			CriteriaQuery<String> query = cb.createQuery( String.class ).select( cb.repeat("hello", cb.literal(3)) );
+			assertEquals( "hellohellohello", session.createQuery( query ).getSingleResult() );
+		} );
+	}
+
 	@Test
 	@RequiresDialect(PostgreSQLDialect.class)
 	public void testCollatePostgreSQL(SessionFactoryScope scope) {