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Implement native support StringView for contains function
Signed-off-by: Tai Le Manh <[email protected]>
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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. | ||
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| //! Common utilities for implementing regex functions | ||
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| use crate::string::common::StringArrayType; | ||
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| use arrow::array::{Array, ArrayDataBuilder, BooleanArray}; | ||
| use arrow::datatypes::DataType; | ||
| use arrow_buffer::{BooleanBufferBuilder, NullBuffer}; | ||
| use datafusion_common::DataFusionError; | ||
| use regex::Regex; | ||
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| use std::collections::HashMap; | ||
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| #[cfg(doc)] | ||
| use arrow::array::{LargeStringArray, StringArray, StringViewArray}; | ||
| /// Perform SQL `array ~ regex_array` operation on | ||
| /// [`StringArray`] / [`LargeStringArray`] / [`StringViewArray`]. | ||
| /// | ||
| /// If `regex_array` element has an empty value, the corresponding result value is always true. | ||
| /// | ||
| /// `flags_array` are optional [`StringArray`] / [`LargeStringArray`] / [`StringViewArray`] flag, | ||
| /// which allow special search modes, such as case-insensitive and multi-line mode. | ||
| /// See the documentation [here](https://docs.rs/regex/1.5.4/regex/#grouping-and-flags) | ||
| /// for more information. | ||
| /// | ||
| /// It is inspired / copied from `regexp_is_match_utf8` [arrow-rs]. | ||
| /// | ||
| /// [arrow-rs]: https://github.com/apache/arrow-rs/blob/8c956a9f9ab26c14072740cce64c2b99cb039b13/arrow-string/src/regexp.rs#L31-L37 | ||
| pub fn regexp_is_match_utf8<'a, S1, S2, S3>( | ||
| array: &'a S1, | ||
| regex_array: &'a S2, | ||
| flags_array: Option<&'a S3>, | ||
| ) -> datafusion_common::Result<BooleanArray, DataFusionError> | ||
| where | ||
| &'a S1: StringArrayType<'a>, | ||
| &'a S2: StringArrayType<'a>, | ||
| &'a S3: StringArrayType<'a>, | ||
| { | ||
| if array.len() != regex_array.len() { | ||
| return Err(DataFusionError::Execution( | ||
| "Cannot perform comparison operation on arrays of different length" | ||
| .to_string(), | ||
| )); | ||
| } | ||
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| let nulls = NullBuffer::union(array.nulls(), regex_array.nulls()); | ||
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| let mut patterns: HashMap<String, Regex> = HashMap::new(); | ||
| let mut result = BooleanBufferBuilder::new(array.len()); | ||
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| let complete_pattern = match flags_array { | ||
| Some(flags) => Box::new(regex_array.iter().zip(flags.iter()).map( | ||
| |(pattern, flags)| { | ||
| pattern.map(|pattern| match flags { | ||
| Some(flag) => format!("(?{flag}){pattern}"), | ||
| None => pattern.to_string(), | ||
| }) | ||
| }, | ||
| )) as Box<dyn Iterator<Item = Option<String>>>, | ||
| None => Box::new( | ||
| regex_array | ||
| .iter() | ||
| .map(|pattern| pattern.map(|pattern| pattern.to_string())), | ||
| ), | ||
| }; | ||
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| array | ||
| .iter() | ||
| .zip(complete_pattern) | ||
| .map(|(value, pattern)| { | ||
| match (value, pattern) { | ||
| (Some(_), Some(pattern)) if pattern == *"" => { | ||
| result.append(true); | ||
| } | ||
| (Some(value), Some(pattern)) => { | ||
| let existing_pattern = patterns.get(&pattern); | ||
| let re = match existing_pattern { | ||
| Some(re) => re, | ||
| None => { | ||
| let re = Regex::new(pattern.as_str()).map_err(|e| { | ||
| DataFusionError::Execution(format!( | ||
| "Regular expression did not compile: {e:?}" | ||
| )) | ||
| })?; | ||
| patterns.entry(pattern).or_insert(re) | ||
| } | ||
| }; | ||
| result.append(re.is_match(value)); | ||
| } | ||
| _ => result.append(false), | ||
| } | ||
| Ok(()) | ||
| }) | ||
| .collect::<datafusion_common::Result<Vec<()>, DataFusionError>>()?; | ||
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| let data = unsafe { | ||
| ArrayDataBuilder::new(DataType::Boolean) | ||
| .len(array.len()) | ||
| .buffers(vec![result.into()]) | ||
| .nulls(nulls) | ||
| .build_unchecked() | ||
| }; | ||
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| Ok(BooleanArray::from(data)) | ||
| } |
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