#1333 - ENH: Support "dynamic formula" with findSingleAttributeList() ... e.g. .select("concat(lastName,', ',firstName)")

Support property alias via "AS" ...  concat(lastName,', ',firstName) as lastName

src/main/java/io/ebeaninternal/server/deploy/DbSqlContext.java

@@ -67,7 +67,7 @@ public interface DbSqlContext {
   /**
    * Parse and add formula with standard table alias replacement.
    */
-  void appendParseSelect(String parseSelect);
+  void appendParseSelect(String parseSelect, String alias);
 
   /**
    * Append a Sql Formula select. This converts the "${ta}" keyword to the

src/main/java/io/ebeaninternal/server/deploy/DynamicPropertyAggregationFormula.java

@@ -16,11 +16,14 @@ class DynamicPropertyAggregationFormula extends DynamicPropertyBase {
 
   private final BeanProperty asTarget;
 
-  DynamicPropertyAggregationFormula(String name, ScalarType<?> scalarType, String parsedFormula, boolean aggregate, BeanProperty asTarget) {
+  private final String alias;
+
+  DynamicPropertyAggregationFormula(String name, ScalarType<?> scalarType, String parsedFormula, boolean aggregate, BeanProperty asTarget, String alias) {
     super(name, name, null, scalarType);
     this.parsedFormula = parsedFormula;
     this.aggregate = aggregate;
     this.asTarget = asTarget;
+    this.alias = alias;
   }
 
   @Override
@@ -49,7 +52,7 @@ class DynamicPropertyAggregationFormula extends DynamicPropertyBase {
 
   @Override
   public void appendSelect(DbSqlContext ctx, boolean subQuery) {
-    ctx.appendParseSelect(parsedFormula);
+    ctx.appendParseSelect(parsedFormula, alias);
   }
 
 }

src/main/java/io/ebeaninternal/server/deploy/FormulaPropertyPath.java

@@ -125,7 +125,7 @@ class FormulaPropertyPath {
     }
 
     String parsedAggregation = buildFormula(parsed);
-    return new DynamicPropertyAggregationFormula(logicalName, scalarType, parsedAggregation, isAggregate(), targetProperty);
+    return new DynamicPropertyAggregationFormula(logicalName, scalarType, parsedAggregation, isAggregate(), targetProperty, alias);
   }
 
   private boolean isAggregate() {

src/main/java/io/ebeaninternal/server/query/DefaultDbSqlContext.java

@@ -274,11 +274,15 @@ class DefaultDbSqlContext implements DbSqlContext {
   }
 
   @Override
-  public void appendParseSelect(String parseSelect) {
-    String converted = alias.parse(parseSelect);
+  public void appendParseSelect(String parseSelect, String columnAlias) {
+    String converted = this.alias.parse(parseSelect);
     sb.append(COMMA);
     sb.append(converted);
-    appendColumnAlias();
+    if (columnAlias != null) {
+      sb.append(" ").append(columnAlias);
+    } else {
+      appendColumnAlias();
+    }
   }
 
   @Override

src/test/java/org/tests/query/aggregation/TestAggregationCount.java

@@ -444,4 +444,31 @@ public class TestAggregationCount extends BaseTestCase {
     assertThat(sql.get(0)).contains("select max(t0.updtime) from contact t0 where t0.phone is null");
   }
 
+
+  @Test
+  public void formula_mapToProperty() {
+
+    ResetBasicData.reset();
+
+    LoggedSqlCollector.start();
+
+    List<Contact> contacts =
+
+      Ebean.find(Contact.class)
+        .select("email, concat(lastName,', ',firstName) as lastName")
+        .where().isNull("phone")
+        .orderBy().asc("lastName")
+        .findList();
+
+    assertThat(contacts).isNotEmpty();
+
+    for (Contact name : contacts) {
+      String lastName = name.getLastName();
+      assertThat(lastName).contains(", ");
+    }
+
+    List<String> sql = LoggedSqlCollector.stop();
+    assertThat(sql.get(0)).contains("select t0.id, t0.email, concat(t0.last_name,', ',t0.first_name) lastName from contact t0 where t0.phone is null  order by t0.last_name; --bind()");
+  }
+
 }