External functions
abs
acos
addDay
addHour
addMilliSecond
addMinute
addMonth
addSecond
addWeek
addYear
ascii_char
ascii_val
asin
atan
atan2
bin_and
bin_or
bin_xor
ceiling
cos
cosh
cot
dow
dpower
floor
getExactTimestamp
i64round
i64truncate
ln
log
log10
lower
lpad
ltrim
mod
*nullif
*nvl
pi
rand
right
round, i64round
rpad
rtrim
sdow
sign
sin
sinh
sqrt
srand
sright
string2blob
strlen
substr
substrlen
tan
tanh
truncate, i64truncate