/Users/andrewlamb/Software/datafusion/datafusion/expr/src/type_coercion/other.rs
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1 | | // Licensed to the Apache Software Foundation (ASF) under one |
2 | | // or more contributor license agreements. See the NOTICE file |
3 | | // distributed with this work for additional information |
4 | | // regarding copyright ownership. The ASF licenses this file |
5 | | // to you under the Apache License, Version 2.0 (the |
6 | | // "License"); you may not use this file except in compliance |
7 | | // with the License. You may obtain a copy of the License at |
8 | | // |
9 | | // http://www.apache.org/licenses/LICENSE-2.0 |
10 | | // |
11 | | // Unless required by applicable law or agreed to in writing, |
12 | | // software distributed under the License is distributed on an |
13 | | // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
14 | | // KIND, either express or implied. See the License for the |
15 | | // specific language governing permissions and limitations |
16 | | // under the License. |
17 | | |
18 | | use arrow::datatypes::DataType; |
19 | | |
20 | | use super::binary::comparison_coercion; |
21 | | |
22 | | /// Attempts to coerce the types of `list_types` to be comparable with the |
23 | | /// `expr_type`. |
24 | | /// Returns the common data type for `expr_type` and `list_types` |
25 | | pub fn get_coerce_type_for_list( |
26 | | expr_type: &DataType, |
27 | | list_types: &[DataType], |
28 | | ) -> Option<DataType> { |
29 | | list_types |
30 | | .iter() |
31 | 0 | .try_fold(expr_type.clone(), |left_type, right_type| { |
32 | 0 | comparison_coercion(&left_type, right_type) |
33 | 0 | }) |
34 | | } |
35 | | |
36 | | /// Find a common coerceable type for all `when_or_then_types` as well |
37 | | /// and the `case_or_else_type`, if specified. |
38 | | /// Returns the common data type for `when_or_then_types` and `case_or_else_type` |
39 | | pub fn get_coerce_type_for_case_expression( |
40 | | when_or_then_types: &[DataType], |
41 | | case_or_else_type: Option<&DataType>, |
42 | | ) -> Option<DataType> { |
43 | | let case_or_else_type = match case_or_else_type { |
44 | | None => when_or_then_types[0].clone(), |
45 | | Some(data_type) => data_type.clone(), |
46 | | }; |
47 | | when_or_then_types |
48 | | .iter() |
49 | 0 | .try_fold(case_or_else_type, |left_type, right_type| { |
50 | 0 | // TODO: now just use the `equal` coercion rule for case when. If find the issue, and |
51 | 0 | // refactor again. |
52 | 0 | comparison_coercion(&left_type, right_type) |
53 | 0 | }) |
54 | | } |