Bug 195970 Two issues when evaluate a query inlcuding a subquery[07]
Description: Currently, when evaluating a query which includes a subquery, the query will be evaluated twice. The binding of query will pass to subquery twice. If user write a java script such as new Date() and i++. The result of query will be incorrect. Another issue: when write the report document, the binding of query will be written twice and the performance is not good to evalulate it twice.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/BindingColumnsEvalUtil.java
for ( int i = 0; i < resultClass.getFieldCount( ); i++ )
					columnNameSet.add( resultClass.getFieldName( i + 1 ) );
			}
			catch ( DataException e )
			{
				
			}
		}
		
		/**
		 * @param columnName
		 * @return
		 */
		private boolean contains( String columnName )
		{
			return columnNameSet.contains( columnName );
		}
		
		/**
		 * @param columnName
		 * @return
		 * @throws DataException
		 */
		private Object getValue( String columnName ) throws DataException
		{
			return ri.getCurrentResult( ).getFieldValue( columnName );
		}
	}
}