Turns out I got the table_column call wrong also. Needs to, like with...

Turns out I got the table_column call wrong also. Needs to, like with everything else in xmldb, fully respecify the column. Now the view migration works in MySQL

htdocs/lib/db/upgrade.php

@@ -320,7 +320,7 @@ function xmldb_core_upgrade($oldversion=0) {
         
 
         // move old block field in view_artefact out of the way
-        table_column('view_artefact', 'block', 'oldblock');
+        table_column('view_artefact', 'block', 'oldblock', 'text', '', '', null);
 
         $table = new XMLDBTable('view_artefact');
         $field = new XMLDBField('block');