Bug 147101 Report generation performance is sluggish
The overall performance of report generation appears to be quite sluggish. Here are numbers that we have measured using ORACLE as a DB. We use ORACLE 10g w/ojdbc14.jar thin driver. select rownum, datetime_id, another_id, text from ( select max(datetime_id) as datetime_id, another_id, text from some_oracle_schema.sample_table where text < 'c%' group by another_id, text ) Query resulting in 8465 rows Using PL/SQL developer: ----------------------- Execution: approx 1 second Iterating through all rows via PL/SQL developer UI: 10 seconds BIRT: ----- Preview page (via dataset editor): shows all 8465 rows in 53 seconds Preview tab (in the designer): shows all 8465 rows in 79 seconds Generation of rptdocument from rptdesign using API: 55 seconds
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/executor/transform/group/GroupCalculationUtil.java
try
				{
					comp1 = (Comparable) DataTypeUtil.toDouble( obj1 );
					comp2 = (Comparable) DataTypeUtil.toDouble( obj2 );
				}
				catch ( BirtException ex )
				{
					
				}
			}
			return comp1.compareTo( comp2 );
		}
		else
		{
			return obj1.toString( ).compareTo( obj2.toString( ) );
		}
	}
}
/**
 * A creator class implemented ICachedObjectCreator. This class is used to
 * create GroupBoundaryInfo object.
 * 
 * @author Administrator
 * 
 */
class GroupBoundaryInfoCreator implements ICachedObjectCreator
{
	/*
	 * (non-Javadoc)
	 * @see org.eclipse.birt.data.engine.cache.ICachedObjectCreator#createInstance(java.lang.Object[])