ATLAS-3530: Retrieve entityDefinition for '_ALL_ENTITY_TYPES' in…

intg/src/main/java/org/apache/atlas/type/AtlasEntityType.java

@@ -643,7 +643,7 @@ public class AtlasEntityType extends AtlasStructType {
             add(new AtlasAttributeDef(CUSTOM_ATTRIBUTES_PROPERTY_KEY, ATLAS_TYPE_STRING, false, true));
         }};
 
-        AtlasEntityDef entityDef = new AtlasEntityDef(ENTITY_ROOT_NAME, "", "", attributeDefs);
+        AtlasEntityDef entityDef = new AtlasEntityDef(ENTITY_ROOT_NAME, "Root entity for system attributes", "1.0", attributeDefs);
 
         return new AtlasEntityType(entityDef);
     }

repository/src/main/java/org/apache/atlas/repository/store/graph/AtlasTypeDefGraphStore.java

@@ -45,6 +45,7 @@ import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
 
+import static org.apache.atlas.model.discovery.SearchParameters.ALL_ENTITY_TYPES;
 import static org.apache.atlas.repository.store.bootstrap.AtlasTypeDefStoreInitializer.getTypesToCreate;
 import static org.apache.atlas.repository.store.bootstrap.AtlasTypeDefStoreInitializer.getTypesToUpdate;
 
@@ -260,8 +261,12 @@ public abstract class AtlasTypeDefGraphStore implements AtlasTypeDefStore {
         AtlasEntityDef ret = typeRegistry.getEntityDefByName(name);
 
         if (ret == null) {
+            ret = StringUtils.equals(name, ALL_ENTITY_TYPES) ? AtlasEntityType.getEntityRoot().getEntityDef() : null;
+
+            if (ret == null) {
                 throw new AtlasBaseException(AtlasErrorCode.TYPE_NAME_NOT_FOUND, name);
             }
+        }
 
         return ret;
     }

repository/src/test/java/org/apache/atlas/repository/store/graph/AtlasTypeDefGraphStoreTest.java

@@ -24,7 +24,6 @@ import org.apache.atlas.TestUtilsV2;
 import org.apache.atlas.exception.AtlasBaseException;
 import org.apache.atlas.model.SearchFilter;
 import org.apache.atlas.model.typedef.*;
-import org.apache.atlas.model.impexp.AtlasExportRequest;
 import org.apache.atlas.model.typedef.AtlasClassificationDef;
 import org.apache.atlas.model.typedef.AtlasEntityDef;
 import org.apache.atlas.model.typedef.AtlasEnumDef;
@@ -32,6 +31,7 @@ import org.apache.atlas.model.typedef.AtlasStructDef;
 import org.apache.atlas.model.typedef.AtlasStructDef.AtlasAttributeDef;
 import org.apache.atlas.runner.LocalSolrRunner;
 import org.apache.atlas.store.AtlasTypeDefStore;
+import org.apache.atlas.type.AtlasEntityType;
 import org.apache.atlas.type.AtlasType;
 import org.apache.atlas.utils.TestResourceFileUtils;
 import org.slf4j.Logger;
@@ -693,4 +693,12 @@ public class AtlasTypeDefGraphStoreTest {
       assertEquals(guid, getBackFromCache.getGuid());
       assertEquals(createdTime, getBackFromCache.getCreateTime());
     }
+
+    @Test
+    public void testGetOnAllEntityTypes() throws AtlasBaseException {
+        AtlasEntityDef entityDefByName = typeDefStore.getEntityDefByName("_ALL_ENTITY_TYPES");
+
+        assertNotNull(entityDefByName);
+        assertEquals(entityDefByName, AtlasEntityType.getEntityRoot().getEntityDef());
+    }
 }