Adds `multikey` parameter to `Merge::MultiRowLookup` transform
Adds multikey
parameter to Merge::MultiRowLookup
transform.
This is set to false
by default to make the change non-breaking. If keycolumn
value is 'a|b', will merge in values for rows with lookup key 'a|b'.
If set to true
(and delim = '|'), will merge in values for rows with lookup key 'a', followed by those with lookup key 'b'