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
else
		{
			fields.add(null);
		}
		
		fields.add( new Boolean( accept ) );
		
		return fields.toArray( );
	}
	/**
	 * Return the start index.
	 * 
	 * @return
	 */
	int getStartIndex( )
	{
		return this.startIndex;
	}
	/**
	 * Return the end index.
	 * 
	 * @return
	 */
	int getEndIndex( )
	{
		return this.endIndex;
	}
	/**
	 * Detect whether the given GroupBoundaryInfo consists of the startIdx and
	 * endIdx that included in current GroupBoundaryInfo instance.