- The extract() function, which was slightly improved in

- The extract() function, which was slightly improved in
0.5.7, needed a lot more work to generate the correct
typecast (the typecasts appear to be necessary in PG's
EXTRACT quite a lot of the time).  The typecast is
now generated using a rule dictionary based
on PG's documentation for date/time/interval arithmetic.
It also accepts text() constructs again, which was broken
in 0.5.7. [ticket:1647]