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/data/dte/ReportQueryBuilder.java
{
											IInputParameterBinding binding = (IInputParameterBinding) iter
													.next( );
											parentTrans.getRowExpressions( )
													.add( binding.getExpr( ) );
										}
									}
								}
							}
							else if ( queries[i] instanceof ISubqueryDefinition )
							{
								
								if ( parentTrans != null )
								{
									parentTrans.getSubqueries( ).add(
											queries[i] );
								}
							}
							registerQueryAndElement( queries[i], item );
						}
					}
					if ( queries.length > 0 )
					{
						IBaseQueryDefinition query = queries[0];
						if ( query != null )
						{
							item.setQuery( query );
							pushQuery( query );
							pushExpressions( query.getRowExpressions( ) );
							handleReportItemExpressions( item );