reifydb_routine/function/date/
subtract.rs

1// SPDX-License-Identifier: Apache-2.0
2// Copyright (c) 2025 ReifyDB
3
4use reifydb_core::value::column::{ColumnWithName, buffer::ColumnBuffer, columns::Columns};
5use reifydb_type::value::{container::temporal::TemporalContainer, date::Date, r#type::Type};
6
7use crate::routine::{Function, FunctionKind, Routine, RoutineInfo, context::FunctionContext, error::RoutineError};
8
9pub struct DateSubtract {
10	info: RoutineInfo,
11}
12
13impl Default for DateSubtract {
14	fn default() -> Self {
15		Self::new()
16	}
17}
18
19impl DateSubtract {
20	pub fn new() -> Self {
21		Self {
22			info: RoutineInfo::new("date::subtract"),
23		}
24	}
25}
26
27impl<'a> Routine<FunctionContext<'a>> for DateSubtract {
28	fn info(&self) -> &RoutineInfo {
29		&self.info
30	}
31
32	fn return_type(&self, _input_types: &[Type]) -> Type {
33		Type::Date
34	}
35
36	fn execute(&self, ctx: &mut FunctionContext<'a>, args: &Columns) -> Result<Columns, RoutineError> {
37		if args.len() != 2 {
38			return Err(RoutineError::FunctionArityMismatch {
39				function: ctx.fragment.clone(),
40				expected: 2,
41				actual: args.len(),
42			});
43		}
44
45		let date_col = &args[0];
46		let dur_col = &args[1];
47		let (date_data, date_bitvec) = date_col.unwrap_option();
48		let (dur_data, dur_bitvec) = dur_col.unwrap_option();
49		let row_count = date_data.len();
50
51		let result_data = match (date_data, dur_data) {
52			(ColumnBuffer::Date(date_container), ColumnBuffer::Duration(dur_container)) => {
53				let mut container = TemporalContainer::with_capacity(row_count);
54
55				for i in 0..row_count {
56					match (date_container.get(i), dur_container.get(i)) {
57						(Some(date), Some(dur)) => {
58							let mut year = date.year();
59							let mut month = date.month() as i32;
60							let mut day = date.day();
61
62							// Subtract months component
63							let total_months = month - dur.get_months();
64							year += (total_months - 1).div_euclid(12);
65							month = (total_months - 1).rem_euclid(12) + 1;
66
67							// Clamp day to valid range for the new month
68							let max_day = days_in_month(year, month as u32);
69							if day > max_day {
70								day = max_day;
71							}
72
73							// Convert to days_since_epoch and subtract days component
74							if let Some(base) = Date::new(year, month as u32, day) {
75								let total_days = base.to_days_since_epoch()
76									- dur.get_days() - (dur.get_nanos()
77									/ 86_400_000_000_000)
78									as i32;
79								match Date::from_days_since_epoch(total_days) {
80									Some(result) => container.push(result),
81									None => container.push_default(),
82								}
83							} else {
84								container.push_default();
85							}
86						}
87						_ => container.push_default(),
88					}
89				}
90
91				ColumnBuffer::Date(container)
92			}
93			(ColumnBuffer::Date(_), other) => {
94				return Err(RoutineError::FunctionInvalidArgumentType {
95					function: ctx.fragment.clone(),
96					argument_index: 1,
97					expected: vec![Type::Duration],
98					actual: other.get_type(),
99				});
100			}
101			(other, _) => {
102				return Err(RoutineError::FunctionInvalidArgumentType {
103					function: ctx.fragment.clone(),
104					argument_index: 0,
105					expected: vec![Type::Date],
106					actual: other.get_type(),
107				});
108			}
109		};
110
111		let final_data = match (date_bitvec, dur_bitvec) {
112			(Some(bv), _) | (_, Some(bv)) => ColumnBuffer::Option {
113				inner: Box::new(result_data),
114				bitvec: bv.clone(),
115			},
116			_ => result_data,
117		};
118
119		Ok(Columns::new(vec![ColumnWithName::new(ctx.fragment.clone(), final_data)]))
120	}
121}
122
123impl Function for DateSubtract {
124	fn kinds(&self) -> &[FunctionKind] {
125		&[FunctionKind::Scalar]
126	}
127}
128
129fn days_in_month(year: i32, month: u32) -> u32 {
130	match month {
131		1 | 3 | 5 | 7 | 8 | 10 | 12 => 31,
132		4 | 6 | 9 | 11 => 30,
133		2 => {
134			if (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0) {
135				29
136			} else {
137				28
138			}
139		}
140		_ => 0,
141	}
142}
reifydb_routine/function/date/subtract.rs

reifydb_routine/function/date/
subtract.rs
