reifydb_routine/function/datetime/
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, datetime::DateTime, r#type::Type};
6
7use crate::routine::{Function, FunctionKind, Routine, RoutineInfo, context::FunctionContext, error::RoutineError};
8
9pub struct DateTimeSubtract {
10	info: RoutineInfo,
11}
12
13impl Default for DateTimeSubtract {
14	fn default() -> Self {
15		Self::new()
16	}
17}
18
19impl DateTimeSubtract {
20	pub fn new() -> Self {
21		Self {
22			info: RoutineInfo::new("datetime::subtract"),
23		}
24	}
25}
26
27impl<'a> Routine<FunctionContext<'a>> for DateTimeSubtract {
28	fn info(&self) -> &RoutineInfo {
29		&self.info
30	}
31
32	fn return_type(&self, _input_types: &[Type]) -> Type {
33		Type::DateTime
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 dt_col = &args[0];
46		let dur_col = &args[1];
47		let (dt_data, dt_bitvec) = dt_col.unwrap_option();
48		let (dur_data, dur_bitvec) = dur_col.unwrap_option();
49		let row_count = dt_data.len();
50
51		let result_data = match (dt_data, dur_data) {
52			(ColumnBuffer::DateTime(dt_container), ColumnBuffer::Duration(dur_container)) => {
53				let mut container = TemporalContainer::with_capacity(row_count);
54
55				for i in 0..row_count {
56					match (dt_container.get(i), dur_container.get(i)) {
57						(Some(dt), Some(dur)) => {
58							let date = dt.date();
59							let time = dt.time();
60							let mut year = date.year();
61							let mut month = date.month() as i32;
62							let mut day = date.day();
63
64							let total_months = month - dur.get_months();
65							year += (total_months - 1).div_euclid(12);
66							month = (total_months - 1).rem_euclid(12) + 1;
67
68							let max_day = days_in_month(year, month as u32);
69							if day > max_day {
70								day = max_day;
71							}
72
73							if let Some(base_date) = Date::new(year, month as u32, day) {
74								let base_days = base_date.to_days_since_epoch() as i64
75									- dur.get_days() as i64;
76								let time_nanos = time.to_nanos_since_midnight() as i64
77									- dur.get_nanos();
78
79								let total_nanos = base_days as i128
80									* 86_400_000_000_000i128 + time_nanos
81									as i128;
82
83								if total_nanos >= 0 && total_nanos <= u64::MAX as i128 {
84									container.push(DateTime::from_nanos(
85										total_nanos as u64,
86									));
87								} else {
88									return Err(RoutineError::FunctionExecutionFailed {
89										function: ctx.fragment.clone(),
90										reason: "datetime cannot be before Unix epoch".to_string(),
91									});
92								}
93							} else {
94								return Err(RoutineError::FunctionExecutionFailed {
95									function: ctx.fragment.clone(),
96									reason: "datetime cannot be before Unix epoch"
97										.to_string(),
98								});
99							}
100						}
101						_ => container.push_default(),
102					}
103				}
104
105				ColumnBuffer::DateTime(container)
106			}
107			(ColumnBuffer::DateTime(_), other) => {
108				return Err(RoutineError::FunctionInvalidArgumentType {
109					function: ctx.fragment.clone(),
110					argument_index: 1,
111					expected: vec![Type::Duration],
112					actual: other.get_type(),
113				});
114			}
115			(other, _) => {
116				return Err(RoutineError::FunctionInvalidArgumentType {
117					function: ctx.fragment.clone(),
118					argument_index: 0,
119					expected: vec![Type::DateTime],
120					actual: other.get_type(),
121				});
122			}
123		};
124
125		let final_data = match (dt_bitvec, dur_bitvec) {
126			(Some(bv), _) | (_, Some(bv)) => ColumnBuffer::Option {
127				inner: Box::new(result_data),
128				bitvec: bv.clone(),
129			},
130			_ => result_data,
131		};
132
133		Ok(Columns::new(vec![ColumnWithName::new(ctx.fragment.clone(), final_data)]))
134	}
135}
136
137impl Function for DateTimeSubtract {
138	fn kinds(&self) -> &[FunctionKind] {
139		&[FunctionKind::Scalar]
140	}
141}
142
143fn days_in_month(year: i32, month: u32) -> u32 {
144	match month {
145		1 | 3 | 5 | 7 | 8 | 10 | 12 => 31,
146		4 | 6 | 9 | 11 => 30,
147		2 => {
148			if (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0) {
149				29
150			} else {
151				28
152			}
153		}
154		_ => 0,
155	}
156}
reifydb_routine/function/datetime/subtract.rs

reifydb_routine/function/datetime/
subtract.rs
