SKY-ALIN commented on code in PR #14282: URL: https://github.com/apache/datafusion/pull/14282#discussion_r1937745027
########## datafusion/functions/src/regex/regexpextract.rs: ########## @@ -0,0 +1,289 @@ +// 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. + +use std::sync::Arc; + +use arrow::array::builder::GenericStringBuilder; +use arrow::array::{Array, ArrayRef, AsArray, OffsetSizeTrait}; +use arrow::datatypes::{DataType, Int64Type}; +use datafusion_common::{ + cast::as_generic_string_array, exec_err, internal_err, plan_err, DataFusionError, + Result, +}; +use datafusion_expr::{ + ColumnarValue, Documentation, ScalarFunctionArgs, ScalarUDFImpl, Signature, + TypeSignature, Volatility, +}; +use datafusion_macros::user_doc; +use regex::Regex; + +#[user_doc( + doc_section(label = "Regular Expression Functions"), + description = "Extract a specific group matched by [regular expression](https://docs.rs/regex/latest/regex/#syntax). If the regex did not match, or the specified group did not match, an empty string is returned..", + syntax_example = "regexp_extract(str, regexp[, idx])", + sql_example = r#"```sql + > select regexp_extract('100-200', '(\d+)-(\d+)', 1); + +---------------------------------------------------------------+ + | regexp_extract(Utf8("100-200"),Utf8("(\d+)-(\d+)"), Int64(1)) | + +---------------------------------------------------------------+ + | [100] | + +---------------------------------------------------------------+ +``` +"#, + standard_argument(name = "str", prefix = "String"), + standard_argument(name = "regexp", prefix = "Regular"), + standard_argument(name = "idx", prefix = "Integer") +)] +#[derive(Debug)] +pub struct RegexpExtractFunc { + signature: Signature, +} + +impl Default for RegexpExtractFunc { + fn default() -> Self { + Self::new() + } +} + +impl RegexpExtractFunc { + pub fn new() -> Self { + Self { + signature: Signature::one_of( + vec![ + TypeSignature::Exact(vec![ + DataType::Utf8, + DataType::Utf8, + DataType::Int64, + ]), + TypeSignature::Exact(vec![ + DataType::LargeUtf8, + DataType::LargeUtf8, + DataType::Int64, + ]), + TypeSignature::Exact(vec![ + DataType::Utf8View, + DataType::Utf8View, + DataType::Int64, + ]), + ], + Volatility::Immutable, + ), + } + } +} + +impl ScalarUDFImpl for RegexpExtractFunc { + fn as_any(&self) -> &dyn std::any::Any { + self + } + + fn name(&self) -> &str { + "regexp_extract" + } + + fn signature(&self) -> &Signature { + &self.signature + } + + fn return_type(&self, arg_types: &[DataType]) -> Result<DataType> { + use DataType::*; + Ok(match &arg_types[0] { + LargeUtf8 | LargeBinary => LargeUtf8, + Utf8 | Binary => Utf8, + Utf8View | BinaryView => Utf8View, + Null => Null, + other => { + return plan_err!( + "The regexp_extract function can only accept strings. Got {other}" + ); + } + }) + } + + fn invoke_with_args(&self, args: ScalarFunctionArgs) -> Result<ColumnarValue> { + let args_len = args.args.len(); + if args_len != 3 { + return exec_err!("regexp_extract was called with {args_len} arguments, but it can accept only 3."); + } + + let target = args.args[0].to_array(args.number_rows)?; + let pattern = args.args[1].to_array(args.number_rows)?; + let idx = args.args[2].to_array(args.number_rows)?; + + let res = regexp_extract_func(&[target, pattern, idx])?; + Ok(ColumnarValue::Array(res)) + } + + fn documentation(&self) -> Option<&Documentation> { + self.doc() + } +} + +fn regexp_extract_func(args: &[ArrayRef; 3]) -> Result<ArrayRef> { + match args[0].data_type() { + DataType::Utf8 | DataType::Utf8View => regexp_extract::<i32>(args), + DataType::LargeUtf8 => regexp_extract::<i64>(args), + other => { + internal_err!("Unsupported data type {other:?} for function regexp_extract") + } + } +} + +fn regexp_extract<T: OffsetSizeTrait>(args: &[ArrayRef]) -> Result<ArrayRef> { + let target = as_generic_string_array::<T>(&args[0])?; Review Comment: Okay, fixed -- This is an automated message from the Apache Git Service. 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