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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 05:27:27 GMT

    [ https://issues.apache.org/jira/browse/DRILL-2288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14984769#comment-14984769
] 

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_r43597994
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/vector/complex/MapVector.java
---
    @@ -309,7 +309,14 @@ public Object getObject(int index) {
           Map<String, Object> vv = new JsonStringHashMap<>();
           for (String child:getChildFieldNames()) {
             ValueVector v = getChild(child);
    -        if (v != null) {
    +        // TODO(DRILL-4001):  Resolve this hack:
    --- End diff --
    
    Can you add what happens if this hack isn't done? What is the error?


> 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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