Bug 122854 There is redundant columns in "available columns" list in "export data" dialog.
Description: There is redundant columns in "available columns" list in "export data" dialog. Steps to reproduce: 1. Preview attached design in web viewer. 2. Select the table and click on "export" button. 3. There is a "detail" column name in "available columns" list which is not data set column.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/DataExtractionTask.java
if ( expr.getText( ).equalsIgnoreCase( selectedColumns[i] ) )
					{
						findColumn = true;
						break;
					}
				}
				if ( findColumn == false )
				{
					throw new EngineException( "Invalid Columns" );
				}
			}
		}
		else
		{
			if ( exprs.size( ) <= 0 )
			{
				throw new EngineException( "Can't exported data in groups" );
			}
			else
			{
				selectedColumns = new String[exprs.size( )];
				Iterator iter = exprs.iterator( );
				
				for ( int i = 0; i < selectedColumns.length; i++ )
				{
					IScriptExpression expr = (IScriptExpression) iter.next( );
					selectedColumns[i] = expr.getText( );
				}
			}
		}