I'm currently evaluating your DBF driver, and I think I've found a bug:
"select count(*) from mattec group by (codigo)" works ok, but "select count(*) from mattec group by (codigo,semestre)", throws "java.sql.SQLException: Failed to calculate [Ljava.lang.Object;@20d0ad's length."
The DBF was created with Clipper 5.01 and both "codigo" and "semestre" are numeric.
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You should use:
select count(*) from mattec group by codigo,semestre
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