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https://issues.apache.org/jira/browse/TAJO-2058?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15198657#comment-15198657
 ] 

ASF GitHub Bot commented on TAJO-2058:
--------------------------------------

Github user eminency commented on a diff in the pull request:

    https://github.com/apache/tajo/pull/944#discussion_r56448985
  
    --- Diff: 
tajo-catalog/tajo-catalog-server/src/main/java/org/apache/tajo/catalog/store/XMLCatalogSchemaManager.java
 ---
    @@ -602,18 +597,10 @@ protected void copySchemaInfo(StoreObject 
sourceStore) {
               unorderedObjects.add(object);
             }
           }
    -      
    -      for (DatabaseObject object: orderedObjects) {
    -        if (object != null) {
    -          mergedObjects.add(object);
    -        }
    -      }
    -      
    -      for (DatabaseObject object: unorderedObjects) {
    -        if (object != null) {
    -          mergedObjects.add(object);
    -        }
    -      }
    +
    +      orderedObjects.stream().filter(object -> object != 
null).forEach(mergedObjects::add);
    +
    +      unorderedObjects.stream().filter(object -> object != 
null).forEach(mergedObjects::add);
    --- End diff --
    
    You can merge two statements into one like this:
    
    ```java
    Stream.concat(orderedObjects.stream(), unorderedObjects.stream())
       .filter(o -> o != null)
       .forEach(mergedObjects::add);
    ```


> foreach loop can be collapsed with stream api
> ---------------------------------------------
>
>                 Key: TAJO-2058
>                 URL: https://issues.apache.org/jira/browse/TAJO-2058
>             Project: Tajo
>          Issue Type: Improvement
>            Reporter: Dongkyu Hwangbo
>            Assignee: Dongkyu Hwangbo
>            Priority: Minor
>              Labels: migration, stream
>
> Currently, TAJO has many foreach loop. To make project more stream-friendly, 
> replacing this loop with stream api is needed.



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