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Thanks for the new query. So the column name in showing up in the argument_columns array, but if argument_columns is null, then it shows up as a string (not array) in the column_names?
Thanks @jeff-vermeer I was hoping for something simpler. I think what I am going to do is to parse the index definition in Python and extract the information I need without using regex. I try to stay away from Regex unless there is no choice.