Bug 124193 Parent axis doesn't work for recursive XPath
When table mapping for XML files is specified via recursive XPath: e.g. "//book", the parent axis access is broken for column mappings on such table: e.g. "../bookstore/@name" will not work. Same parent axis access works fine if non-recursive XPath is used for table mapping: e.g. "/bookstore/book".
data/org.eclipse.birt.report.data.oda.xml/src/org/eclipse/birt/report/data/oda/xml/util/RelationInformation.java
{
		this.columnInfos.put( ci.getColumnName( ), ci );
	}
	/**
	 * Add a filter to a table.
	 * 
	 * @param columnName
	 * @param value
	 */
	public void addFilter( String columnName, String value )
	{
		this.filterInfos.put( columnName, value );
	}
	/**
	 * Return the column name array.
	 * 
	 * @return
	 */
	public String[] getColumnNames( )
	{
		Object[] names = this.columnInfos.keySet( ).toArray( );
		String[] result = new String[names.length];
		for ( int i = 0; i < names.length; i++ )
		{
			result[( (ColumnInfo) columnInfos.get( names[i] ) ).getColumnIndex( ) - 1] = names[i].toString( );
		}
		return result;
	}
	/**
	 * The nested xml columnNames are the names of columns the value of which may be shared by multiple