You're still dealing with query slots though -- which remains difficult to estimate. As far as I know the only way to figure that out is to actually run the que

You're still dealing with query slots though -- which remains difficult to estimate. As far as I know the only way to figure that out is to actually run the query and then check how many slots it used. Am I wrong? I'm certainly not a BigQuery expert. If you're downvoting do you mind leaving a comment on why I'm wrong? I'm interested in knowing more. The documentation for BigQuery doesn't really explain how slots are allocated and what they're capable of.