function getSampleRows() {
  var parentTable = db.getSchema().table('Parent');
  var parentRow = parentTable.createRow({
    id: 'parentId',
    name: 'parentName'
  });

  var childTable = db.getSchema().table('Child');
  var childRow = childTable.createRow({
    id: 'childId',
    parentId: 'parentId',
    name: 'childName'
  });

  return [parentRow, childRow];
}
@return {!Array<!lf.Row>} The parent and child rows.