Access Reducer attributes (#3637)

src/main/java/redis/clients/jedis/search/aggr/Reducer.java

@@ -29,6 +29,18 @@ public final Reducer as(String alias) {
     return this;
   }
 
+  public final String getName() {
+    return name;
+  }
+
+  public final String getField() {
+    return field;
+  }
+
+  public final String getAlias() {
+    return alias;
+  }
+
   protected abstract List<Object> getOwnArgs();
 
   public final void addArgs(List<Object> args) {

src/test/java/redis/clients/jedis/modules/search/AggregationBuilderTest.java

@@ -0,0 +1,28 @@
+package redis.clients.jedis.modules.search;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+import org.junit.Test;
+
+import redis.clients.jedis.search.aggr.Reducer;
+import redis.clients.jedis.search.aggr.Reducers;
+
+public class AggregationBuilderTest {
+
+  @Test
+  public void reducerObject() {
+    Reducer reducer = Reducers.sum("@count").as("total");
+    assertEquals("SUM", reducer.getName());
+    assertEquals("@count", reducer.getField());
+    assertEquals("total", reducer.getAlias());
+  }
+
+  @Test
+  public void countObject() {
+    Reducer count = Reducers.count();
+    assertEquals("COUNT", count.getName());
+    assertNull(count.getField());
+    assertNull(count.getAlias());
+  }
+}