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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-2288) ScanBatch violates IterOutcome protocol for zero-row sources [was: missing JDBC metadata (schema) for 0-row results...]
Date Mon, 02 Nov 2015 05:24:27 GMT

    [ https://issues.apache.org/jira/browse/DRILL-2288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14984764#comment-14984764
] 

ASF GitHub Bot commented on DRILL-2288:
---------------------------------------

Github user jacques-n commented on a diff in the pull request:

    https://github.com/apache/drill/pull/228#discussion_r43597916
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/record/RecordBatch.java ---
    @@ -23,60 +23,214 @@
     import org.apache.drill.exec.record.selection.SelectionVector4;
     
     /**
    - * A record batch contains a set of field values for a particular range of records. In
the case of a record batch
    - * composed of ValueVectors, ideally a batch fits within L2 cache (~256k per core). The
set of value vectors do not
    - * change unless the next() IterOutcome is a *_NEW_SCHEMA type.
    - *
    - * A key thing to know is that the Iterator provided by record batch must align with
the rank positions of the field ids
    - * provided utilizing getValueVectorId();
    + * A record batch contains a set of field values for a particular range of
    --- End diff --
    
    Nice documentation on this code.


> ScanBatch violates IterOutcome protocol for zero-row sources [was: missing JDBC metadata
(schema) for 0-row results...]
> -----------------------------------------------------------------------------------------------------------------------
>
>                 Key: DRILL-2288
>                 URL: https://issues.apache.org/jira/browse/DRILL-2288
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Storage - Information Schema
>            Reporter: Daniel Barclay (Drill)
>            Assignee: Daniel Barclay (Drill)
>             Fix For: 1.3.0
>
>         Attachments: Drill2288NoResultSetMetadataWhenZeroRowsTest.java
>
>
> The ResultSetMetaData object from getMetadata() of a ResultSet is not set up (getColumnCount()
returns zero, and trying to access any other metadata throws IndexOutOfBoundsException) for
a result set with zero rows, at least for one from DatabaseMetaData.getColumns(...).



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