'Combining fields in a Couchbase Spring-Data Query

I have a couchbase query that needs to search for a name, the object being searched stores firstName and lastName fields. My search query may be something like "Bob Smith", I have tried combining the fields in the query however this does not work ?

@Query("#{#n1ql.selectEntity} WHERE #{#n1ql.filter} AND LOWER(firstName) + ' ' + LOWER(lastName) LIKE $1 ")


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