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
* 
	 * @param gbi
	 * @return
	 */
	boolean isInBoundary( GroupBoundaryInfo gbi )
	{
		if ( gbi.getStartIndex( ) >= this.getStartIndex( )
				&& gbi.getEndIndex( ) <= this.getEndIndex( ) )
			return true;
		else
			return false;
	}
	/**
	 * Set the sort conditions
	 * 
	 * @param sortKeys
	 * @param sortOrderings
	 */
	void setSortCondition( Object[] sortKeys, boolean[] sortOrderings )
	{
		this.sortKeys = sortKeys;
		this.sortDirections = sortOrderings;
	}
	/**
	 * Return the sort keys array.
	 * 
	 * @return
	 */
	Object[] getSortKeys( )
	{