instance method change_column

# File activerecord/lib/active_record/connection_adapters/sqlite3/schema_definitions.rb, line 8
        def change_column(column_name, type, **options)
          name = column_name.to_s

          existing_column = @columns_hash[name]
          if existing_column
            existing_options = existing_column.options.except(:precision)
            options = existing_options.merge(options)
          end

          @columns_hash[name] = nil
          column(name, type, **options)
        end