#2753 - Fix for, Bug findSingleAttributeList o2m distinct

ebean-core/src/main/java/io/ebeaninternal/server/core/OrmQueryRequest.java

@@ -458,8 +458,8 @@ public final class OrmQueryRequest<T> extends BeanRequest implements SpiOrmQuery
   /**
    * Return the many property that is fetched in the query or null if there is not one.
    */
-  public BeanPropertyAssocMany<?> manyProperty() {
-    return manyProperty;
+  public BeanPropertyAssocMany<?> manyPropertyForOrderBy() {
+    return query.isSingleAttribute() ? null : manyProperty;
   }
 
   /**

ebean-core/src/main/java/io/ebeaninternal/server/query/CQueryPredicates.java

@@ -225,7 +225,7 @@ public final class CQueryPredicates {
    */
   private void parsePropertiesToDbColumns(DeployParser deployParser) {
     // order by is dependent on the manyProperty (if there is one)
-    String logicalOrderBy = deriveOrderByWithMany(request.manyProperty());
+    String logicalOrderBy = deriveOrderByWithMany(request.manyPropertyForOrderBy());
     if (logicalOrderBy != null) {
       dbOrderBy = deployParser.parse(logicalOrderBy);
     }
@@ -234,7 +234,7 @@ public final class CQueryPredicates {
     dbWhere = deriveWhere(deployParser);
     dbFilterMany = deriveFilterMany(deployParser);
     dbHaving = deriveHaving(deployParser);
-    // all includes including ones for manyWhere clause
+    // all includes, including ones for manyWhere clause
     predicateIncludes = deployParser.getIncludes();
   }
 
@@ -293,8 +293,7 @@ public final class CQueryPredicates {
   }
 
   /**
-   * There is a many property so we need to make sure the ordering is
-   * appropriate.
+   * There is a many property we need to make sure the ordering is appropriate.
    */
   private String deriveOrderByWithMany(BeanPropertyAssocMany<?> manyProp) {
     if (manyProp == null) {

ebean-test/src/test/java/org/tests/query/other/TestQuerySingleAttribute.java

@@ -757,8 +757,7 @@ public class TestQuerySingleAttribute extends BaseTestCase {
   }
 
   @Test
-  public void oneToMany_distinct() {
-
+  void oneToMany_distinct() {
     ResetBasicData.reset();
 
     Query<Customer> query = DB.find(Customer.class)