79150cf9bb
Before this change the query used an index scan to perform the export, this could be really expensive on the database. After the change the the query will use far more efficient joins, on a large MySQL instance this can take minutes off of the query time. In additon the query was returning two columns that are not used in the function. The layout column was causing the UNION to fail on Oracle as it cannot compare text columns, removing these columns from the returned data should further increase performance further.
Moodle
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