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SUMMARY
The latest ClickHouse driver comes with its own DB engine spec for Superset, which breaks the dropdown for selecting a database because the key in the select option is no longer unique. I fixed this by adding using the option index as the key, as well as renaming the Superset DB engine spec to "ClickHouse Connect (Superset)" to differentiate from the native DB engine spec.
In the future we should probably consider removing our ClickHouse Connect DB engine spec.
BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
Before:
After:
TESTING INSTRUCTIONS
ADDITIONAL INFORMATION