text: --- date
  
  create table t1 (d1 date);
  
  insert into t1 values (date'2001-10-11');
  
  
  select abs(d1) from t1;
  
  drop table t1;
  
  
  select abs(date'2001-10-10');
  
  prepare st from 'select abs(?)';
  execute st using date'2001-10-11';
  
  
  