CONCAT_WS in custom sql query

'CONCAT_WS(',', wp_postmeta.meta_key, wp_postmeta.meta_value)' was the name of the column. Everything is working as it should.

To change the name of the column, add AS name after the CONCAT_WS statement, like this:

'CONCAT_WS(',', wp_postmeta.meta_key, wp_postmeta.meta_value)' AS name (I didn’t test this specifically).

Now the new column will be called name.