code: def _get_index_name_by_column(table, column_name):
      
      protected_name = metadata.protect_name(column_name)
      possible_index_values = [protected_name, "values(%s)" % protected_name]
      for index_metadata in table.indexes.values():
          options = dict(index_metadata.index_options)
          if options.get('target') in possible_index_values:
              return index_metadata.name
docs: Find the index name for a given table and column.