message: [SQL Lab] Show tooltip on schema and table select options
  Closes
diff: @@ -130,7 +130,11 @@ export default class TableSelector extends React.PureComponent {
  this.setState(() => ({
  filterOptions,
  tableLoading: false,
  - tableOptions: json.options,
  + tableOptions: json.options.map(o => ({
  + value: o.value,
  + label: o.label,
  + title: o.label,
  + })),
  }));
  })
  .catch(() => {
  @@ -150,7 +154,7 @@ export default class TableSelector extends React.PureComponent {
  return SupersetClient.get({ endpoint })
  .then(({ json }) => {
  - const schemaOptions = json.schemas.map(s => ({ value: s, label: s }));
  + const schemaOptions = json.schemas.map(s => ({ value: s, label: s, title: s }));
  this.setState({ schemaOptions, schemaLoading: false });
  })
  .catch(() => {
  