What is the use of “multiValued” field type in Solr?

Question

I\'m new to Apache Solr. Even after reading the documentation part, I\'m finding it difficult to clearly understand the functionality and use of the multiValued

Answer 1

I use multiple value fields only with copyfields, so think this way, say all fields will be single valued unless it's a copyfield, for example I have following fields:

I want to query one field only and possibly to search all 4 fields above, then we need to use copyfield. first to create a new field call 'all', then copy everything into 'all'

Now field 'all' need to be multi-valued.