union: Check if two maps can be combined based on whether map 0 column 0 label contains map 1 column 0 label instead of being equal. This allows map 0's input 0 root to contain the datasource name as well as a format that allows it to be combined with a more general map. Added ignore flag to not print an error if column labels don't match.
union: Check if two maps can be combined based on whether map 0 column 0 label contains map 1 column 0 label instead of being equal. This allows map 0's input 0 root to contain the datasource name as well as a format that allows it to be combined with a more general map. Added ignore flag to not print an error if column labels don't match.