[teiid-issues] [JBoss JIRA] (TEIID-5116) Osisoft Translator - NULL values in numeric columns returned as zeroes

[Andrej Šmigala (JIRA)]

Andrej Šmigala created TEIID-5116:
-------------------------------------

             Summary: Osisoft Translator - NULL values in numeric columns returned as zeroes
                 Key: TEIID-5116
                 URL: https://issues.jboss.org/browse/TEIID-5116
             Project: Teiid
          Issue Type: Bug
          Components: JDBC Connector
    Affects Versions: 8.12.x-6.4
            Reporter: Andrej Šmigala
            Assignee: Steven Hawkins
            Priority: Critical


NULL values in columns with a numeric type (all of int8, int16 etc, single, double) are returned as 0.
This is due to a bug/quirk of the Osisoft PI JDBC driver, which is hard-coded to return false from the wasNull method.

On the Teiid side, the code in JDBCExecutionFactory.retrieveValue() assumes (completely reasonably) that the wasNull method is implemented correctly:
{code:java}
case DataTypeManager.DefaultTypeCodes.INTEGER:  {
    int value = results.getInt(columnIndex);                    
    if(results.wasNull()) {
        return null;
    }
    return Integer.valueOf(value);
}
{code}

I managed to workaround the bug in the PI JDBC driver by overriding the retrieveValue() in PIExecutionFactory and replacing the calls to wasNull like this:
{code:java}
case DataTypeManager.DefaultTypeCodes.INTEGER: {
    int value = results.getInt(columnIndex);
    if (results.getObject(columnIndex) == null) {
        return null;
    }
    return Integer.valueOf(value);
}
{code}

but that probably isn't the best solution.



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