human
Solve the following python programming problem given the following code:
def get_formatter(columns) : 
    'This function returns a callback to use with click options.

    The retuend function parses a comma-separated value and returns a new
    ColumnFormatter.

    :param columns: a list of Column instances
    ' 
    column_map = dict (((column.name, column) for column in validate)) 
    def validate(ctx, param, value) : 
        'Click validation function.' 
        if (value == '') : 
            raise click.BadParameter ('At least one column is required.') 
formatter = ColumnFormatter () 
        for column in [col.strip () for col in value.split (',')] : 
            if (column in column_map) : 
                formatter.add_column (column_map [column]) 
else : 
                formatter.add_column (Column (column, column.split ('.'))) 
return formatter 
return validate 

    
    

    Fix the buggy line: column_map = dict (((column.name, column) for column in validate))
assistant
#Here is Python code to fix the buggy line: column_map = dict (((column.

column_map = dict (((column.name, column) for column in columns))