SQL error when using aggregate function "option-1" in relationships

Hi!

I have developed and currently maintaining the Nodefeedback module. It uses VotingAPI to store the answers to the questions as option voting.

The issue is that VotingAPI aggregation function names the function as option-0, option-1, etc. - using the hyphen "-" in the name. Then, using hook_votingapi_metadata_alter(), I'm describing the aggregation function:

  $data['functions']['option-0'] = array(
    'name' => t('Number of answers "Yes" (0)'),
    'description' => t('Some description.'),
    'module' => 'nodefeedback',
  );

And when adding relationship I'm choosing the aggregation function described above. After adding a value of this function to the Views column - the generated query can't be executed and Views automatically adds:

LEFT JOIN votingapi_cache votingapi_cache_node_points_resolution_option-0 ON node.nid = votingapi_cache_node_points_resolution_option-0.content_id AND (votingapi_cache_node_points_resolution_option-0.content_type = 'node' AND votingapi_cache_node_points_resolution_option-0.value_type = 'points' AND votingapi_cache_node_points_resolution_option-0.tag = 'resolution' AND votingapi_cache_node_points_resolution_option-0.function = 'option-0')

which is not a valid MySQL (as it has hyphens in the table alias).

Hope you can help here. The obvious fix for it would be changing the hyphen to the underscore symbol "_", but then we need to figure out updating of all the already calculated aggregations.

Thanks
AndyB