| // 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. |
| |
| //! Utilities for working with strings |
| |
| use arrow::array::{Array, AsArray}; |
| use arrow::datatypes::DataType; |
| |
| /// Convenient function to convert an Arrow string array to a vector of strings |
| pub fn string_array_to_vec(array: &dyn Array) -> Vec<Option<&str>> { |
| match array.data_type() { |
| DataType::Utf8 => array.as_string::<i32>().iter().collect(), |
| DataType::LargeUtf8 => array.as_string::<i64>().iter().collect(), |
| DataType::Utf8View => array.as_string_view().iter().collect(), |
| _ => unreachable!(), |
| } |
| } |
