reifydb_routine/function/date/
day_of_week.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::r#type::Type;
6
7use crate::routine::{Function, FunctionKind, Routine, RoutineInfo, context::FunctionContext, error::RoutineError};
8
9pub struct DateDayOfWeek {
10	info: RoutineInfo,
11}
12
13impl Default for DateDayOfWeek {
14	fn default() -> Self {
15		Self::new()
16	}
17}
18
19impl DateDayOfWeek {
20	pub fn new() -> Self {
21		Self {
22			info: RoutineInfo::new("date::day_of_week"),
23		}
24	}
25}
26
27impl<'a> Routine<FunctionContext<'a>> for DateDayOfWeek {
28	fn info(&self) -> &RoutineInfo {
29		&self.info
30	}
31
32	fn return_type(&self, _input_types: &[Type]) -> Type {
33		Type::Int4
34	}
35
36	fn execute(&self, ctx: &mut FunctionContext<'a>, args: &Columns) -> Result<Columns, RoutineError> {
37		if args.len() != 1 {
38			return Err(RoutineError::FunctionArityMismatch {
39				function: ctx.fragment.clone(),
40				expected: 1,
41				actual: args.len(),
42			});
43		}
44
45		let column = &args[0];
46		let (data, bitvec) = column.unwrap_option();
47		let row_count = data.len();
48
49		let result_data = match data {
50			ColumnBuffer::Date(container) => {
51				let mut result = Vec::with_capacity(row_count);
52				let mut res_bitvec = Vec::with_capacity(row_count);
53
54				for i in 0..row_count {
55					if let Some(date) = container.get(i) {
56						// ISO 8601: Mon=1, Sun=7
57						// 1970-01-01 was Thursday (ISO day 4), so days_since_epoch 0 = Thursday
58						// (days + 3) % 7 shifts Thursday=0 to Monday=0 base
59						// +7) % 7 handles negative days, +1 converts to 1-based
60						let days = date.to_days_since_epoch();
61						let dow = ((days % 7 + 3) % 7 + 7) % 7 + 1;
62						result.push(dow);
63						res_bitvec.push(true);
64					} else {
65						result.push(0);
66						res_bitvec.push(false);
67					}
68				}
69
70				ColumnBuffer::int4_with_bitvec(result, res_bitvec)
71			}
72			other => {
73				return Err(RoutineError::FunctionInvalidArgumentType {
74					function: ctx.fragment.clone(),
75					argument_index: 0,
76					expected: vec![Type::Date],
77					actual: other.get_type(),
78				});
79			}
80		};
81
82		let final_data = if let Some(bv) = bitvec {
83			ColumnBuffer::Option {
84				inner: Box::new(result_data),
85				bitvec: bv.clone(),
86			}
87		} else {
88			result_data
89		};
90
91		Ok(Columns::new(vec![ColumnWithName::new(ctx.fragment.clone(), final_data)]))
92	}
93}
94
95impl Function for DateDayOfWeek {
96	fn kinds(&self) -> &[FunctionKind] {
97		&[FunctionKind::Scalar]
98	}
99}
reifydb_routine/function/date/day_of_week.rs

reifydb_routine/function/date/
day_of_week.rs
