[METAMODEL-1] Only use CSV count approximation when "where items" is empty

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Assignee: Kasper Sørensen
• Reporter: Kasper Sørensen
• Created: 30/Jul/13 09:31
• Updated: 27/Jan/14 21:05
• Resolved: 27/Jan/14 21:05

Description

I accidentally discovered this bug today while working with the MetaModel codebase.

It seems that when doing an "approximate COUNT" query on a CSV file we don't check if there are any WHERE items present in the query also. I added that as a check to return null when there are where items in the query (indicating that the count query cannot be handled in a optimized fashion - which will in turn cause a count to be made by actually counting all records).

The patch is available here:
https://gist.github.com/kaspersorensen/6079811

Regards,
Kasper