risingwave_expr_impl/table_function/
unnest.rs

1// Copyright 2025 RisingWave Labs
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15use risingwave_common::array::ListRef;
16use risingwave_common::types::ScalarRefImpl;
17use risingwave_expr::function;
18
19#[function(
20    "unnest(anyarray) -> setof any",
21    type_infer = "|args| Ok(args[0].unnest_list().clone())"
22)]
23fn unnest(list: ListRef<'_>) -> impl Iterator<Item = Option<ScalarRefImpl<'_>>> {
24    list.flatten().iter()
25}