Retrieve columns by name iso index
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                 Key: DDLUTILS-217
                 URL: https://issues.apache.org/jira/browse/DDLUTILS-217
             Project: DdlUtils
          Issue Type: Improvement
          Components: Core (No specific database)
    Affects Versions: 1.0
            Reporter: Rick Riemer
            Assignee: Thomas Dudziak
             Fix For: 1.1


MetaDataColumnDescriptor.readColumn() currently attempts to find the column 
index of a column before retrieving it from the ResultSet in order for it to 
return the default value if the column does not exist. Some JDBC 
implementations (e.g. IBM's DB2 JCC4 driver) have broken ResultSetMetaData 
implementations however, which do not return the correct columns names.

By attempting to retrieve the columns by name iso index before retrieving the 
ResultSetMetaData we avoid hitting these broken paths in the general case. It 
has the added benefit of not having to retrieve the result set meta data for 
each column read, which may be potentially harmful to the performance.

I'm attaching a patch which implements this behavior.

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