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
viewer.getTextWidget( ).setFont( JFaceResources.getTextFont( ) );
		attachMenus( viewer );
        
        GridData data = new GridData(GridData.FILL_BOTH);
        viewer.getControl().setLayoutData(data);
        
        
        addDropSupportToViewer();
        
        if(isExternalEditorConfigured())
        {
            Button btnExternalEditor = new Button(composite, SWT.NONE);
            btnExternalEditor.setText("Edit with external editor");
            btnExternalEditor.addSelectionListener(this);
        }
        
        
        viewer.getTextWidget( ).addKeyListener( new KeyListener( ) {
			public void keyPressed( KeyEvent e )
			{
				if ( isUndoKeyPress( e ) )
				{
					viewer.doOperation( ITextOperationTarget.UNDO );
				}
				else if ( isRedoKeyPress( e ) )
				{
					viewer.doOperation( ITextOperationTarget.REDO );
				}
			}
			private boolean isUndoKeyPress( KeyEvent e )