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When concatenating column fields in order to perform aggregation on them (e.g. group concatenation), we need to preserve all null values in the data passed to each column callback. Co-authored-by: Carlos Castillo <carlos.castillo@moodle.com>
.-..-.
_____ | || |
/____/-.---_ .---. .---. .-.| || | .---.
| | _ _ |/ _ \/ _ \/ _ || |/ __ \
* | | | | | || |_| || |_| || |_| || || |___/
|_| |_| |_|\_____/\_____/\_____||_|\_____)
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