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upper.rs
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upper.rs
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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.
//! Defines kernel to extract a upper case of a \[Large\]StringArray
use super::utils::utf8_apply;
use crate::array::*;
use crate::{
datatypes::DataType,
error::{ArrowError, Result},
};
/// Returns a new `Array` where each of each of the elements is upper-cased.
/// this function errors when the passed array is not a \[Large\]String array.
pub fn upper(array: &dyn Array) -> Result<Box<dyn Array>> {
match array.data_type() {
DataType::LargeUtf8 => Ok(Box::new(utf8_apply(
str::to_uppercase,
array
.as_any()
.downcast_ref::<Utf8Array<i64>>()
.expect("A large string is expected"),
))),
DataType::Utf8 => Ok(Box::new(utf8_apply(
str::to_uppercase,
array
.as_any()
.downcast_ref::<Utf8Array<i32>>()
.expect("A string is expected"),
))),
_ => Err(ArrowError::InvalidArgumentError(format!(
"upper does not support type {:?}",
array.data_type()
))),
}
}
/// Checks if an array of type `datatype` can perform upper operation
///
/// # Examples
/// ```
/// use arrow2::compute::upper::can_upper;
/// use arrow2::datatypes::{DataType};
///
/// let data_type = DataType::Utf8;
/// assert_eq!(can_upper(&data_type), true);
///
/// let data_type = DataType::Null;
/// assert_eq!(can_upper(&data_type), false);
/// ```
pub fn can_upper(data_type: &DataType) -> bool {
matches!(data_type, DataType::LargeUtf8 | DataType::Utf8)
}