Bug 201013 [Automation][Regression]Invalid group key column name: _{$TEMP_GROUP_1$} occurs when preview attached report[1102]
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/QueryExecutor.java
exprText );
					int index = columnInfo.getColumnIndex( );
					String name = columnInfo.getColumnName( );
					if ( name == null && index < 0 )
					{
						
						
						
						temporaryComputedColumns.add( new ComputedColumn( "_{$TEMP_FILTER_"
								+ i + "$}_",
								exprText,
								DataType.ANY_TYPE ) );
						it.remove( );
						result.add( new FilterDefinition( new ConditionalExpression( new ScriptExpression( String.valueOf( "dataSetRow[\"_{$TEMP_FILTER_"
								+ i + "$}_\"]" ) ),
								ce.getOperator( ),
								ce.getOperand1( ),
								ce.getOperand2( ) ) ) );
					}
				}
			}
		}
	}
	/**
	 * 
	 * @param filter
	 * @return
	 * @throws DataException 
	 */
	private boolean isGroupFilter( IFilterDefinition filter ) throws DataException