reifydb_routine/function/datetime/
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 DateTimeDayOfWeek {
10	info: RoutineInfo,
11}
12
13impl Default for DateTimeDayOfWeek {
14	fn default() -> Self {
15		Self::new()
16	}
17}
18
19impl DateTimeDayOfWeek {
20	pub fn new() -> Self {
21		Self {
22			info: RoutineInfo::new("datetime::day_of_week"),
23		}
24	}
25}
26
27impl<'a> Routine<FunctionContext<'a>> for DateTimeDayOfWeek {
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::DateTime(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(dt) = container.get(i) {
56						let date = dt.date();
57						// ISO 8601: Mon=1, Sun=7
58						// 1970-01-01 was Thursday (ISO day 4), so days_since_epoch 0 = Thursday
59						// (days + 3) % 7 shifts Thursday=0 to Monday=0 base
60						// +7) % 7 handles negative days, +1 converts to 1-based
61						let days = date.to_days_since_epoch();
62						let dow = ((days % 7 + 3) % 7 + 7) % 7 + 1;
63						result.push(dow);
64						res_bitvec.push(true);
65					} else {
66						result.push(0);
67						res_bitvec.push(false);
68					}
69				}
70
71				ColumnBuffer::int4_with_bitvec(result, res_bitvec)
72			}
73			other => {
74				return Err(RoutineError::FunctionInvalidArgumentType {
75					function: ctx.fragment.clone(),
76					argument_index: 0,
77					expected: vec![Type::DateTime],
78					actual: other.get_type(),
79				});
80			}
81		};
82
83		let final_data = if let Some(bv) = bitvec {
84			ColumnBuffer::Option {
85				inner: Box::new(result_data),
86				bitvec: bv.clone(),
87			}
88		} else {
89			result_data
90		};
91
92		Ok(Columns::new(vec![ColumnWithName::new(ctx.fragment.clone(), final_data)]))
93	}
94}
95
96impl Function for DateTimeDayOfWeek {
97	fn kinds(&self) -> &[FunctionKind] {
98		&[FunctionKind::Scalar]
99	}
100}
reifydb_routine/function/datetime/day_of_week.rs

reifydb_routine/function/datetime/
day_of_week.rs
