sync columns from source not working

The sync columns from source button in the chart data source editor fails.

Expected results

When I click the sync column button, superset will update the columns available in the chart per the data source.

Actual results

I get an error and the column that was added to the datasource isn’t available.

Screenshots

How to reproduce the bug

1. Run a query in sqllab only selecting a subset of columns.
2. Click Explore to make a chart.
3. Click on Edit datasource
4. Add a column to the datasource
5. Click save
6. Click on Edit datasource
7. Click on the Columns tab.
8. Click sync columns from source

Environment

(please complete the following information):

• superset version: 1.3
• python version: 3.8.9
• node.js version: n/a
• any feature flags active:
  • ENABLE_TEMPLATE_PROCESSING
  • ALERT_REPORTS
  • DASHBOARD_CROSS_FILTERS
  • DASHBOARD_NATIVE_FILTERS

Checklist

Make sure to follow these steps before submitting your issue - thank you!

• I have checked the superset logs for python stacktraces and included it here as text if there are any.
• I have reproduced the issue with at least the latest released version of superset.
• I have checked the issue tracker for the same issue and I haven’t found one similar.

[villebro]

I have flagged the fix PRs for 1.3.1 (I will start working on rc1 this weekend).

[villebro]

@heoun if you need to change the schema you should be able to do it in the save chart editor modal. If this doesn’t work please open a new ticket with detailed reproduction steps. Closing this ticket as this bug is fixed on the forthcoming version 1.3.1.