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// Copyright 2024 RisingWave Labs | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
|
||
use risingwave_common::types::{Datum, ScalarRefImpl}; | ||
use risingwave_common_estimate_size::EstimateSize; | ||
use risingwave_expr::aggregate; | ||
use risingwave_expr::aggregate::AggStateDyn; | ||
|
||
/// Note that different from `min` and `max`, `first_value` doesn't ignore `NULL` values. | ||
/// | ||
/// ```slt | ||
/// statement ok | ||
/// create table t(v1 int, ts int); | ||
/// | ||
/// statement ok | ||
/// insert into t values (null, 1), (2, 2), (null, 3); | ||
/// | ||
/// query I | ||
/// select first_value(v1 order by ts) from t; | ||
/// ---- | ||
/// NULL | ||
/// | ||
/// statement ok | ||
/// drop table t; | ||
/// ``` | ||
#[aggregate("first_value(any) -> any")] | ||
fn first_value(state: &mut FirstValueState, input: Option<ScalarRefImpl<'_>>) { | ||
if state.0.is_none() { | ||
state.0 = Some(input.map(|x| x.into_scalar_impl())); | ||
} | ||
} | ||
|
||
#[derive(Debug, Clone, Default, EstimateSize)] | ||
struct FirstValueState(Option<Datum>); | ||
|
||
impl AggStateDyn for FirstValueState {} | ||
|
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impl From<&FirstValueState> for Datum { | ||
fn from(state: &FirstValueState) -> Self { | ||
if let Some(state) = &state.0 { | ||
state.clone() | ||
} else { | ||
None | ||
} | ||
} | ||
} | ||
|
||
/// Note that different from `min` and `max`, `last_value` doesn't ignore `NULL` values. | ||
/// | ||
/// ```slt | ||
/// statement ok | ||
/// create table t(v1 int, ts int); | ||
/// | ||
/// statement ok | ||
/// insert into t values (null, 1), (2, 2), (null, 3); | ||
/// | ||
/// query I | ||
/// select last_value(v1 order by ts) from t; | ||
/// ---- | ||
/// NULL | ||
/// | ||
/// statement ok | ||
/// drop table t; | ||
/// ``` | ||
#[aggregate("last_value(*) -> auto", state = "ref")] // TODO(rc): `last_value(any) -> any` | ||
fn last_value<T>(_: Option<T>, input: Option<T>) -> Option<T> { | ||
input | ||
} | ||
|
||
#[aggregate("internal_last_seen_value(*) -> auto", state = "ref", internal)] | ||
fn internal_last_seen_value<T>(state: T, input: T, retract: bool) -> T { | ||
if retract { | ||
state | ||
} else { | ||
input | ||
} | ||
} |
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