use reifydb_core::value::column::{ColumnWithName, buffer::ColumnBuffer, columns::Columns};
use reifydb_type::value::{container::temporal::TemporalContainer, datetime::DateTime, r#type::Type};
use crate::routine::{Function, FunctionKind, Routine, RoutineInfo, context::FunctionContext, error::RoutineError};
pub struct DateTimeTrunc {
info: RoutineInfo,
}
impl Default for DateTimeTrunc {
fn default() -> Self {
Self::new()
}
}
impl DateTimeTrunc {
pub fn new() -> Self {
Self {
info: RoutineInfo::new("datetime::trunc"),
}
}
}
impl<'a> Routine<FunctionContext<'a>> for DateTimeTrunc {
fn info(&self) -> &RoutineInfo {
&self.info
}
fn return_type(&self, _input_types: &[Type]) -> Type {
Type::DateTime
}
fn execute(&self, ctx: &mut FunctionContext<'a>, args: &Columns) -> Result<Columns, RoutineError> {
if args.len() != 2 {
return Err(RoutineError::FunctionArityMismatch {
function: ctx.fragment.clone(),
expected: 2,
actual: args.len(),
});
}
let dt_col = &args[0];
let prec_col = &args[1];
let (dt_data, dt_bitvec) = dt_col.unwrap_option();
let (prec_data, prec_bitvec) = prec_col.unwrap_option();
let row_count = dt_data.len();
let result_data = match (dt_data, prec_data) {
(
ColumnBuffer::DateTime(dt_container),
ColumnBuffer::Utf8 {
container: prec_container,
..
},
) => {
let mut container = TemporalContainer::with_capacity(row_count);
for i in 0..row_count {
match (dt_container.get(i), prec_container.is_defined(i)) {
(Some(dt), true) => {
let precision = prec_container.get(i).unwrap();
let truncated = match precision {
"year" => DateTime::new(dt.year(), 1, 1, 0, 0, 0, 0),
"month" => DateTime::new(
dt.year(),
dt.month(),
1,
0,
0,
0,
0,
),
"day" => DateTime::new(
dt.year(),
dt.month(),
dt.day(),
0,
0,
0,
0,
),
"hour" => DateTime::new(
dt.year(),
dt.month(),
dt.day(),
dt.hour(),
0,
0,
0,
),
"minute" => DateTime::new(
dt.year(),
dt.month(),
dt.day(),
dt.hour(),
dt.minute(),
0,
0,
),
"second" => DateTime::new(
dt.year(),
dt.month(),
dt.day(),
dt.hour(),
dt.minute(),
dt.second(),
0,
),
other => {
return Err(
RoutineError::FunctionExecutionFailed {
function: ctx.fragment.clone(),
reason: format!(
"invalid precision: '{}'",
other
),
},
);
}
};
match truncated {
Some(val) => container.push(val),
None => container.push_default(),
}
}
_ => container.push_default(),
}
}
ColumnBuffer::DateTime(container)
}
(ColumnBuffer::DateTime(_), other) => {
return Err(RoutineError::FunctionInvalidArgumentType {
function: ctx.fragment.clone(),
argument_index: 1,
expected: vec![Type::Utf8],
actual: other.get_type(),
});
}
(other, _) => {
return Err(RoutineError::FunctionInvalidArgumentType {
function: ctx.fragment.clone(),
argument_index: 0,
expected: vec![Type::DateTime],
actual: other.get_type(),
});
}
};
let final_data = match (dt_bitvec, prec_bitvec) {
(Some(bv), _) | (_, Some(bv)) => ColumnBuffer::Option {
inner: Box::new(result_data),
bitvec: bv.clone(),
},
_ => result_data,
};
Ok(Columns::new(vec![ColumnWithName::new(ctx.fragment.clone(), final_data)]))
}
}
impl Function for DateTimeTrunc {
fn kinds(&self) -> &[FunctionKind] {
&[FunctionKind::Scalar]
}
}