reifydb_function/date/
trunc.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, r#type::Type};
6
7use crate::{
8	ScalarFunction, ScalarFunctionContext,
9	error::{ScalarFunctionError, ScalarFunctionResult},
10	propagate_options,
11};
12
13pub struct DateTrunc;
14
15impl DateTrunc {
16	pub fn new() -> Self {
17		Self
18	}
19}
20
21impl ScalarFunction for DateTrunc {
22	fn scalar(&self, ctx: ScalarFunctionContext) -> ScalarFunctionResult<ColumnData> {
23		if let Some(result) = propagate_options(self, &ctx) {
24			return result;
25		}
26
27		let columns = ctx.columns;
28		let row_count = ctx.row_count;
29
30		if columns.len() != 2 {
31			return Err(ScalarFunctionError::ArityMismatch {
32				function: ctx.fragment.clone(),
33				expected: 2,
34				actual: columns.len(),
35			});
36		}
37
38		let date_col = columns.get(0).unwrap();
39		let prec_col = columns.get(1).unwrap();
40
41		match (date_col.data(), prec_col.data()) {
42			(
43				ColumnData::Date(date_container),
44				ColumnData::Utf8 {
45					container: prec_container,
46					..
47				},
48			) => {
49				let mut container = TemporalContainer::with_capacity(row_count);
50
51				for i in 0..row_count {
52					match (date_container.get(i), prec_container.is_defined(i)) {
53						(Some(d), true) => {
54							let precision = &prec_container[i];
55							let truncated =
56								match precision.as_str() {
57									"year" => Date::new(d.year(), 1, 1),
58									"month" => Date::new(d.year(), d.month(), 1),
59									other => {
60										return Err(ScalarFunctionError::ExecutionFailed {
61										function: ctx.fragment.clone(),
62										reason: format!("invalid precision: '{}'", other),
63									});
64									}
65								};
66							match truncated {
67								Some(val) => container.push(val),
68								None => container.push_default(),
69							}
70						}
71						_ => container.push_default(),
72					}
73				}
74
75				Ok(ColumnData::Date(container))
76			}
77			(ColumnData::Date(_), other) => Err(ScalarFunctionError::InvalidArgumentType {
78				function: ctx.fragment.clone(),
79				argument_index: 1,
80				expected: vec![Type::Utf8],
81				actual: other.get_type(),
82			}),
83			(other, _) => Err(ScalarFunctionError::InvalidArgumentType {
84				function: ctx.fragment.clone(),
85				argument_index: 0,
86				expected: vec![Type::Date],
87				actual: other.get_type(),
88			}),
89		}
90	}
91
92	fn return_type(&self, _input_types: &[Type]) -> Type {
93		Type::Date
94	}
95}
reifydb_function/date/trunc.rs

reifydb_function/date/
trunc.rs
