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moodle/reportbuilder/classes
Paul Holden 5582bc2ded MDL-74656 reportbuilder: ensure nulls preserved in column callbacks.
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>
2022-07-19 08:23:54 +01:00
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