Joined Data Table Error Message
If there is an error in the join definition, the Join icon, or Left/Right Column drop-down is marked with a red border. Consequently, the preview is not displayed.
For example, if the join keys have different data types, an error message is displayed:
“A panopticon.developer.tables.standalone.TimeColumn column from the left table in the join is not compatible with a panopticon.developer.tables.standalone.NumericColumn column in the right.”
Make the necessary changes to make the join work.
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