reifydb_function/datetime/
diff.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, duration::Duration, r#type::Type};
6
7use crate::{ScalarFunction, ScalarFunctionContext, error::ScalarFunctionError, propagate_options};
8
9pub struct DateTimeDiff;
10
11impl DateTimeDiff {
12	pub fn new() -> Self {
13		Self
14	}
15}
16
17impl ScalarFunction for DateTimeDiff {
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 col1 = columns.get(0).unwrap();
34		let col2 = columns.get(1).unwrap();
35
36		match (col1.data(), col2.data()) {
37			(ColumnData::DateTime(container1), ColumnData::DateTime(container2)) => {
38				let mut container = TemporalContainer::with_capacity(row_count);
39
40				for i in 0..row_count {
41					match (container1.get(i), container2.get(i)) {
42						(Some(dt1), Some(dt2)) => {
43							let diff_nanos =
44								dt1.to_nanos_since_epoch() - dt2.to_nanos_since_epoch();
45							container.push(Duration::from_nanoseconds(diff_nanos));
46						}
47						_ => container.push_default(),
48					}
49				}
50
51				Ok(ColumnData::Duration(container))
52			}
53			(ColumnData::DateTime(_), other) => Err(ScalarFunctionError::InvalidArgumentType {
54				function: ctx.fragment.clone(),
55				argument_index: 1,
56				expected: vec![Type::DateTime],
57				actual: other.get_type(),
58			}),
59			(other, _) => Err(ScalarFunctionError::InvalidArgumentType {
60				function: ctx.fragment.clone(),
61				argument_index: 0,
62				expected: vec![Type::DateTime],
63				actual: other.get_type(),
64			}),
65		}
66	}
67
68	fn return_type(&self, _input_types: &[Type]) -> Type {
69		Type::Duration
70	}
71}
reifydb_function/datetime/diff.rs

reifydb_function/datetime/
diff.rs
