Bug 123915 Add table-fetch limitation when DataSet Editor is populating table names.
When fetch table names from database of large volume of data, there lies a possibility that the editor window will be frozen because of the population of huge number of table names. This should be enhanced. A handy solution might be limiting the number of table names being fetched each schema.
data/org.eclipse.birt.report.data.oda.jdbc.ui/src/org/eclipse/birt/report/data/oda/jdbc/ui/editors/SQLDataSetEditorPage.java
public void dragOver( DropTargetEvent event )
			{
				event.feedback = DND.FEEDBACK_SCROLL
						| DND.FEEDBACK_INSERT_BEFORE;
			}
			public void dragOperationChanged( DropTargetEvent event )
			{
				dragEnter( event );
			}
			public void drop( DropTargetEvent event )
			{
				if ( event.data instanceof String )
					insertText( (String) event.data );
			}
		} );
	}
	/**
	 * Insert a text string into the text area
	 * 
	 * @param text
	 */
	private void insertText( String text )
	{
		StyledText textWidget = viewer.getTextWidget( );
		int selectionStart = textWidget.getSelection( ).x;
		textWidget.insert( text );
		textWidget.setSelection( selectionStart + text.length( ) );
		textWidget.setFocus( );
	}
	/**