How to comprehend the evaluation results?

Hello，
when I get the evaluation results,I am not sure the meaning of "predicted_parse_error" and "exact".I guess when "predicted_parse_error" is true it means the model can’t produce a predicted sql,is that right?And I found "exact" has 3 possibilities:true,0 and false,I guess when "exact" is true ,it means the predicted sql is right.But what do 0 and false mean?
Thank you.