/Users/andrewlamb/Software/datafusion/datafusion/physical-expr/src/expressions/unknown_column.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 | | //! UnKnownColumn expression |
19 | | |
20 | | use std::any::Any; |
21 | | use std::hash::{Hash, Hasher}; |
22 | | use std::sync::Arc; |
23 | | |
24 | | use crate::PhysicalExpr; |
25 | | |
26 | | use arrow::{ |
27 | | datatypes::{DataType, Schema}, |
28 | | record_batch::RecordBatch, |
29 | | }; |
30 | | use datafusion_common::{internal_err, Result}; |
31 | | use datafusion_expr::ColumnarValue; |
32 | | |
33 | | #[derive(Debug, Hash, PartialEq, Eq, Clone)] |
34 | | pub struct UnKnownColumn { |
35 | | name: String, |
36 | | } |
37 | | |
38 | | impl UnKnownColumn { |
39 | | /// Create a new unknown column expression |
40 | 0 | pub fn new(name: &str) -> Self { |
41 | 0 | Self { |
42 | 0 | name: name.to_owned(), |
43 | 0 | } |
44 | 0 | } |
45 | | |
46 | | /// Get the column name |
47 | 0 | pub fn name(&self) -> &str { |
48 | 0 | &self.name |
49 | 0 | } |
50 | | } |
51 | | |
52 | | impl std::fmt::Display for UnKnownColumn { |
53 | 0 | fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result { |
54 | 0 | write!(f, "{}", self.name) |
55 | 0 | } |
56 | | } |
57 | | |
58 | | impl PhysicalExpr for UnKnownColumn { |
59 | | /// Return a reference to Any that can be used for downcasting |
60 | 0 | fn as_any(&self) -> &dyn std::any::Any { |
61 | 0 | self |
62 | 0 | } |
63 | | |
64 | | /// Get the data type of this expression, given the schema of the input |
65 | 0 | fn data_type(&self, _input_schema: &Schema) -> Result<DataType> { |
66 | 0 | Ok(DataType::Null) |
67 | 0 | } |
68 | | |
69 | | /// Decide whether this expression is nullable, given the schema of the input |
70 | 0 | fn nullable(&self, _input_schema: &Schema) -> Result<bool> { |
71 | 0 | Ok(true) |
72 | 0 | } |
73 | | |
74 | | /// Evaluate the expression |
75 | 0 | fn evaluate(&self, _batch: &RecordBatch) -> Result<ColumnarValue> { |
76 | 0 | internal_err!("UnKnownColumn::evaluate() should not be called") |
77 | 0 | } |
78 | | |
79 | 0 | fn children(&self) -> Vec<&Arc<dyn PhysicalExpr>> { |
80 | 0 | vec![] |
81 | 0 | } |
82 | | |
83 | 0 | fn with_new_children( |
84 | 0 | self: Arc<Self>, |
85 | 0 | _children: Vec<Arc<dyn PhysicalExpr>>, |
86 | 0 | ) -> Result<Arc<dyn PhysicalExpr>> { |
87 | 0 | Ok(self) |
88 | 0 | } |
89 | | |
90 | 0 | fn dyn_hash(&self, state: &mut dyn Hasher) { |
91 | 0 | let mut s = state; |
92 | 0 | self.hash(&mut s); |
93 | 0 | } |
94 | | } |
95 | | |
96 | | impl PartialEq<dyn Any> for UnKnownColumn { |
97 | 0 | fn eq(&self, _other: &dyn Any) -> bool { |
98 | 0 | // UnknownColumn is not a valid expression, so it should not be equal to any other expression. |
99 | 0 | // See https://github.com/apache/datafusion/pull/11536 |
100 | 0 | false |
101 | 0 | } |
102 | | } |