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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-5546) Schema change problems caused by empty batch
Date Wed, 23 Aug 2017 01:10:02 GMT

    [ https://issues.apache.org/jira/browse/DRILL-5546?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16137713#comment-16137713
] 

ASF GitHub Bot commented on DRILL-5546:
---------------------------------------

Github user paul-rogers commented on a diff in the pull request:

    https://github.com/apache/drill/pull/906#discussion_r134627196
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/project/ProjectRecordBatch.java
---
    @@ -768,4 +765,73 @@ else if (exprHasPrefix && refHasPrefix) {
           }
         }
       }
    +
    +  /**
    +   * handle FAST NONE specially when Project for query output. This happens when input
returns a
    +   * FAST NONE directly ( input does not return any batch with schema/data).
    +   *
    +   * Project operator has to return a batch with schema derived using the following 3
rules:
    +   *  Case 1:  *  ==>  expand into an empty list of columns.
    +   *  Case 2:  regular column reference ==> treat as nullable-int column
    +   *  Case 3:  expressions => Call ExpressionTreeMaterialization over an empty vector
contain.
    --- End diff --
    
    Again, this is HTML, so:
    
    \<ul>
    \<li>Case 1: ...\</li>
    ...
    \</ul>


> Schema change problems caused by empty batch
> --------------------------------------------
>
>                 Key: DRILL-5546
>                 URL: https://issues.apache.org/jira/browse/DRILL-5546
>             Project: Apache Drill
>          Issue Type: Bug
>            Reporter: Jinfeng Ni
>            Assignee: Jinfeng Ni
>
> There have been a few JIRAs opened related to schema change failure caused by empty batch.
This JIRA is opened as an umbrella for all those related JIRAS ( such as DRILL-4686, DRILL-4734,
DRILL4476, DRILL-4255, etc).
>  



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