Blocker Steps to reproduce
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Look into the error log of cron.php or run tag_cron() in tags/lib.php.
Error Message
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Default exception handler: Fehler beim Lesen der Datenbank Debug: ERROR: column "co.id" must appear in the GROUP BY clause or be used in an aggregate function
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LINE 1: SELECT ta.tagid, tb.tagid AS correlation, co.id AS correlati...
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^
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SELECT ta.tagid, tb.tagid AS correlation, co.id AS correlationid, co.correlatedtags
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FROM mdl_tag_instance ta
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LEFT JOIN mdl_tag_instance tb
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ON (ta.itemtype = tb.itemtype AND ta.itemid = tb.itemid AND ta.tagid <> tb.tagid)
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LEFT JOIN mdl_tag_correlation co
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ON co.tagid = ta.tagid
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WHERE tb.tagid IS NOT NULL
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GROUP BY ta.tagid, tb.tagid
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HAVING COUNT(*) > $1
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ORDER BY ta.tagid ASC, COUNT(*) DESC, tb.tagid ASC
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[array (
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0 => 2,
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)]
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* line 391 of /lib/dml/moodle_database.php: dml_read_exception thrown
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* line 232 of /lib/dml/pgsql_native_moodle_database.php: call to moodle_database->query_end()
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* line 634 of /lib/dml/pgsql_native_moodle_database.php: call to pgsql_native_moodle_database->query_end()
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* line 844 of /tag/lib.php: call to pgsql_native_moodle_database->get_recordset_sql()
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* line 910 of /tag/lib.php: call to tag_compute_correlations()
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* line 310 of /lib/cronlib.php: call to tag_cron()
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* line 61 of /admin/cli/cron.php: call to cron_run()}}
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Suggested Fix
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It's probably save to just add co.id and co.correlatedtags to the GROUP BY clause.
