reifydb_function/datetime/
add.rs

1// SPDX-License-Identifier: AGPL-3.0-or-later
2// Copyright (c) 2025 ReifyDB
3
4use reifydb_core::value::column::data::ColumnData;
5use reifydb_type::value::{container::temporal::TemporalContainer, date::Date, datetime::DateTime, r#type::Type};
6
7use crate::{ScalarFunction, ScalarFunctionContext, error::ScalarFunctionError, propagate_options};
8
9pub struct DateTimeAdd;
10
11impl DateTimeAdd {
12	pub fn new() -> Self {
13		Self
14	}
15}
16
17impl ScalarFunction for DateTimeAdd {
18	fn scalar(&self, ctx: ScalarFunctionContext) -> crate::error::ScalarFunctionResult<ColumnData> {
19		if let Some(result) = propagate_options(self, &ctx) {
20			return result;
21		}
22		let columns = ctx.columns;
23		let row_count = ctx.row_count;
24
25		if columns.len() != 2 {
26			return Err(ScalarFunctionError::ArityMismatch {
27				function: ctx.fragment.clone(),
28				expected: 2,
29				actual: columns.len(),
30			});
31		}
32
33		let dt_col = columns.get(0).unwrap();
34		let dur_col = columns.get(1).unwrap();
35
36		match (dt_col.data(), dur_col.data()) {
37			(ColumnData::DateTime(dt_container), ColumnData::Duration(dur_container)) => {
38				let mut container = TemporalContainer::with_capacity(row_count);
39
40				for i in 0..row_count {
41					match (dt_container.get(i), dur_container.get(i)) {
42						(Some(dt), Some(dur)) => {
43							let date = dt.date();
44							let time = dt.time();
45							let mut year = date.year();
46							let mut month = date.month() as i32;
47							let mut day = date.day();
48
49							// Add months component
50							let total_months = month + dur.get_months();
51							year += (total_months - 1).div_euclid(12);
52							month = (total_months - 1).rem_euclid(12) + 1;
53
54							// Clamp day to valid range for the new month
55							let max_day = days_in_month(year, month as u32);
56							if day > max_day {
57								day = max_day;
58							}
59
60							// Convert to seconds since epoch and add day/nanos components
61							if let Some(base_date) = Date::new(year, month as u32, day) {
62								let base_days = base_date.to_days_since_epoch() as i64
63									+ dur.get_days() as i64;
64								let time_nanos = time.to_nanos_since_midnight() as i64
65									+ dur.get_nanos();
66
67								let total_seconds =
68									base_days * 86400 + time_nanos / 1_000_000_000;
69								let nano_part = (time_nanos % 1_000_000_000) as u32;
70
71								match DateTime::from_parts(total_seconds, nano_part) {
72									Ok(result) => container.push(result),
73									Err(_) => container.push_default(),
74								}
75							} else {
76								container.push_default();
77							}
78						}
79						_ => container.push_default(),
80					}
81				}
82
83				Ok(ColumnData::DateTime(container))
84			}
85			(ColumnData::DateTime(_), other) => Err(ScalarFunctionError::InvalidArgumentType {
86				function: ctx.fragment.clone(),
87				argument_index: 1,
88				expected: vec![Type::Duration],
89				actual: other.get_type(),
90			}),
91			(other, _) => Err(ScalarFunctionError::InvalidArgumentType {
92				function: ctx.fragment.clone(),
93				argument_index: 0,
94				expected: vec![Type::DateTime],
95				actual: other.get_type(),
96			}),
97		}
98	}
99
100	fn return_type(&self, _input_types: &[Type]) -> Type {
101		Type::DateTime
102	}
103}
104
105fn days_in_month(year: i32, month: u32) -> u32 {
106	match month {
107		1 | 3 | 5 | 7 | 8 | 10 | 12 => 31,
108		4 | 6 | 9 | 11 => 30,
109		2 => {
110			if (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0) {
111				29
112			} else {
113				28
114			}
115		}
116		_ => 0,
117	}
118}
reifydb_function/datetime/add.rs

reifydb_function/datetime/
add.rs
