Paul Holden
5582bc2ded
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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