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
{
				numberOfSchema = preferences.getInt( DateSetPreferencePage.USER_MAX_NUM_OF_SCHEMA );
			}
			else
			{
				numberOfSchema = DateSetPreferencePage.DEFAULT_MAX_NUM_OF_SCHEMA;
				preferences.setValue( DateSetPreferencePage.USER_MAX_NUM_OF_SCHEMA,
						numberOfSchema );
			}
			cachedSchemaComboIndex = schemaCombo.getSelectionIndex();
			if ( schemaCombo.getSelectionIndex() == 0)
			{
				targetSchemaList = schemaList;
			}
			else
			{
				targetSchemaList.add( schemaCombo.getItem( schemaCombo.getSelectionIndex() ));
				numberOfSchema = 1;
			}
			for ( int i = 0; i < targetSchemaList.size( ) && i < numberOfSchema; i++ )
			{
				String schemaName = (String) targetSchemaList.get( i );
				DbObject schemaObj = new DbObject( schemaName,
						schemaName,
						DbObject.SCHEMA_TYPE,
						schemaImage );
				schemaObjectList.add( schemaObj );
			}
			TreeItem[] items = Utility.createTreeItems( rootNode,
					schemaObjectList,