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еditing of long CLOB data cutting the field's value
The problem lies in the way CLOBs are handled. Only a subset of the CLOB (the noted 2000 chars) is loaded from the database. This in turn creates further problems: Updates on such rows should not work - at least if the DBMS realy does compares on BLOB types).
There are problems remaining in 206233 (patches are supplied in that bug), but 206233 should fix this issue.